diff --git a/helpers/helpers.v2.1.d/apps b/helpers/helpers.v2.1.d/apps
index 81a5717eb..f0c856a23 100644
--- a/helpers/helpers.v2.1.d/apps
+++ b/helpers/helpers.v2.1.d/apps
@@ -8,7 +8,6 @@
 # Requires YunoHost version *.*.* or higher.
 ynh_install_apps() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=a
 	local -A args_array=([a]=apps=)
 	local apps
 	# Manage arguments with getopts
@@ -127,7 +126,6 @@ ynh_remove_apps() {
 # If the app relies on a specific PHP version, then `php` will be aliased that version. The PHP command will also be appended with the `phpflags` settings.
 ynh_spawn_app_shell() {
         # Declare an array to define the options of this helper.
-        local legacy_args=a
         local -A args_array=([a]=app=)
         local app
         # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/apt b/helpers/helpers.v2.1.d/apt
index d5a1f4335..51a339544 100644
--- a/helpers/helpers.v2.1.d/apt
+++ b/helpers/helpers.v2.1.d/apt
@@ -28,7 +28,7 @@ ynh_wait_dpkg_free() {
                 # Check if the name of this file contains only numbers.
                 if echo "$dpkg_file" | grep --perl-regexp --quiet "^[[:digit:]]+$"; then
                     # If so, that a remaining of dpkg.
-                    ynh_print_err "dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
+                    ynh_print_err --message="dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
                     set -o xtrace # set -x
                     return 1
                 fi
@@ -43,21 +43,15 @@ ynh_wait_dpkg_free() {
 
 # Check either a package is installed or not
 #
-# example: ynh_package_is_installed --package=yunohost && echo "installed"
+# example: ynh_package_is_installed foobar && echo "installed"
 #
-# usage: ynh_package_is_installed --package=name
-# | arg: -p, --package=     - the package name to check
+# usage: ynh_package_is_installed name
+# | arg: name - the package name to check
 # | ret: 0 if the package is installed, 1 else.
 #
 # Requires YunoHost version 2.2.4 or higher.
 ynh_package_is_installed() {
-    # Declare an array to define the options of this helper.
-    local legacy_args=p
-    local -A args_array=([p]=package=)
-    local package
-    # Manage arguments with getopts
-    ynh_handle_getopts_args "$@"
-
+    local package=$1
     dpkg-query --show --showformat='${Status}' "$package" 2>/dev/null \
         | grep --count "ok installed" &>/dev/null
 }
@@ -75,7 +69,6 @@ ynh_package_is_installed() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_package_version() {
     # Declare an array to define the options of this helper.
-    local legacy_args=p
     local -A args_array=([p]=package=)
     local package
     # Manage arguments with getopts
@@ -310,7 +303,7 @@ ynh_install_app_dependencies() {
         YNH_INSTALL_APP_DEPENDENCIES_REPLACE="false"
     else
         local current_dependencies=""
-        if ynh_package_is_installed --package="${dep_app}-ynh-deps"
+        if ynh_package_is_installed "${dep_app}-ynh-deps"
         then
             current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
             current_dependencies=${current_dependencies// | /|}
@@ -352,7 +345,6 @@ EOF
 # Requires YunoHost version 3.8.1 or higher.
 ynh_add_app_dependencies() {
     # Declare an array to define the options of this helper.
-    local legacy_args=pr
     local -A args_array=([p]=package= [r]=replace)
     local package
     # Manage arguments with getopts
@@ -375,7 +367,7 @@ ynh_remove_app_dependencies() {
     local dep_app=${app//_/-}	# Replace all '_' by '-'
 
     local current_dependencies=""
-    if ynh_package_is_installed --package="${dep_app}-ynh-deps"; then
+    if ynh_package_is_installed "${dep_app}-ynh-deps"; then
         current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
         current_dependencies=${current_dependencies// | /|}
     fi
@@ -409,7 +401,6 @@ ynh_remove_app_dependencies() {
 # Requires YunoHost version 3.8.1 or higher.
 ynh_install_extra_app_dependencies() {
     # Declare an array to define the options of this helper.
-    local legacy_args=rpkn
     local -A args_array=([r]=repo= [p]=package= [k]=key= [n]=name=)
     local repo
     local package
@@ -454,7 +445,6 @@ ynh_install_extra_app_dependencies() {
 # Requires YunoHost version 3.8.1 or higher.
 ynh_install_extra_repo() {
     # Declare an array to define the options of this helper.
-    local legacy_args=rkpna
     local -A args_array=([r]=repo= [k]=key= [p]=priority= [n]=name= [a]=append)
     local repo
     local key
@@ -523,7 +513,6 @@ ynh_install_extra_repo() {
 # Requires YunoHost version 3.8.1 or higher.
 ynh_remove_extra_repo() {
     # Declare an array to define the options of this helper.
-    local legacy_args=n
     local -A args_array=([n]=name=)
     local name
     # Manage arguments with getopts
@@ -532,7 +521,7 @@ ynh_remove_extra_repo() {
 
     ynh_secure_remove --file="/etc/apt/sources.list.d/$name.list"
     # Sury pinning is managed by the regenconf in the core...
-    [[ "$name" == "extra_php_version" ]] || ynh_secure_remove "/etc/apt/preferences.d/$name"
+    [[ "$name" == "extra_php_version" ]] || ynh_secure_remove --file="/etc/apt/preferences.d/$name"
     if [ -e /etc/apt/trusted.gpg.d/$name.gpg ]; then
         ynh_secure_remove --file="/etc/apt/trusted.gpg.d/$name.gpg"
     fi
@@ -564,7 +553,6 @@ ynh_remove_extra_repo() {
 # Requires YunoHost version 3.8.1 or higher.
 ynh_add_repo() {
     # Declare an array to define the options of this helper.
-    local legacy_args=uscna
     local -A args_array=([u]=uri= [s]=suite= [c]=component= [n]=name= [a]=append)
     local uri
     local suite
@@ -604,7 +592,6 @@ ynh_add_repo() {
 # Requires YunoHost version 3.8.1 or higher.
 ynh_pin_repo() {
     # Declare an array to define the options of this helper.
-    local legacy_args=pirna
     local -A args_array=([p]=package= [i]=pin= [r]=priority= [n]=name= [a]=append)
     local package
     local pin
diff --git a/helpers/helpers.v2.1.d/backup b/helpers/helpers.v2.1.d/backup
index a596ac9e0..f08495923 100644
--- a/helpers/helpers.v2.1.d/backup
+++ b/helpers/helpers.v2.1.d/backup
@@ -65,7 +65,6 @@ ynh_backup() {
     # TODO find a way to avoid injection by file strange naming !
 
     # Declare an array to define the options of this helper.
-    local legacy_args=sdbm
     local -A args_array=([s]=src_path= [d]=dest_path= [b]=is_big [m]=not_mandatory)
     local src_path
     local dest_path
@@ -237,7 +236,6 @@ with open(sys.argv[1], 'r') as backup_file:
 # Requires YunoHost version 3.5.0 or higher for the argument --not_mandatory
 ynh_restore_file() {
     # Declare an array to define the options of this helper.
-    local legacy_args=odm
     local -A args_array=([o]=origin_path= [d]=dest_path= [m]=not_mandatory)
     local origin_path
     local dest_path
@@ -305,7 +303,6 @@ ynh_restore_file() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_store_file_checksum() {
     # Declare an array to define the options of this helper.
-    local legacy_args=f
     local -A args_array=([f]=file= [u]=update_only)
     local file
     local update_only
@@ -356,7 +353,6 @@ ynh_store_file_checksum() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_backup_if_checksum_is_different() {
     # Declare an array to define the options of this helper.
-    local legacy_args=f
     local -A args_array=([f]=file=)
     local file
     # Manage arguments with getopts
@@ -372,13 +368,13 @@ ynh_backup_if_checksum_is_different() {
             backup_file_checksum="/var/cache/yunohost/appconfbackup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
             mkdir --parents "$(dirname "$backup_file_checksum")"
             cp --archive "$file" "$backup_file_checksum" # Backup the current file
-            ynh_print_warn "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file_checksum"
+            ynh_print_warn --message="File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file_checksum"
             echo "$backup_file_checksum" # Return the name of the backup file
             if [ ${PACKAGE_CHECK_EXEC:-0} -eq 1 ]; then
                 local file_path_base64=$(echo "$file" | base64 -w0)
                 if test -e /var/cache/yunohost/appconfbackup/original_${file_path_base64}
                 then
-                    ynh_print_warn "Diff with the original file:"
+                    ynh_print_warn --message="Diff with the original file:"
                     diff --report-identical-files --unified --color=always /var/cache/yunohost/appconfbackup/original_${file_path_base64} $file >&2 || true
                 fi
             fi
@@ -396,7 +392,6 @@ ynh_backup_if_checksum_is_different() {
 # Requires YunoHost version 3.3.1 or higher.
 ynh_delete_file_checksum() {
     # Declare an array to define the options of this helper.
-    local legacy_args=f
     local -A args_array=([f]=file=)
     local file
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/config b/helpers/helpers.v2.1.d/config
index de35c7744..6fdc74cd9 100644
--- a/helpers/helpers.v2.1.d/config
+++ b/helpers/helpers.v2.1.d/config
@@ -320,7 +320,7 @@ ynh_app_action_run() {
         #ynh_return "result:"
         #ynh_return "$(echo "${result}" | sed 's/^/  /g')"
     else
-        ynh_die "No handler defined in app's script for action $1. If you are the maintainer of this app, you should define '$runner'"
+        ynh_die --message="No handler defined in app's script for action $1. If you are the maintainer of this app, you should define '$runner'"
     fi
 }
 
diff --git a/helpers/helpers.v2.1.d/fail2ban b/helpers/helpers.v2.1.d/fail2ban
index 613dcc490..9343d2bea 100644
--- a/helpers/helpers.v2.1.d/fail2ban
+++ b/helpers/helpers.v2.1.d/fail2ban
@@ -59,7 +59,6 @@
 # Requires YunoHost version 4.1.0 or higher.
 ynh_add_fail2ban_config() {
     # Declare an array to define the options of this helper.
-    local legacy_args=lrmptv
     local -A args_array=([l]=logpath= [r]=failregex= [m]=max_retry= [p]=ports= [t]=use_template)
     local logpath
     local failregex
diff --git a/helpers/helpers.v2.1.d/getopts b/helpers/helpers.v2.1.d/getopts
index f9ef5dc0b..1e32bc982 100644
--- a/helpers/helpers.v2.1.d/getopts
+++ b/helpers/helpers.v2.1.d/getopts
@@ -48,168 +48,138 @@
 ynh_handle_getopts_args() {
     # Manage arguments only if there's some provided
     set +o xtrace # set +x
-    if [ $# -ne 0 ]; then
-        # Store arguments in an array to keep each argument separated
-        local arguments=("$@")
+    if [ $# -eq 0 ]; then
+        set -o xtrace # set -x
+        return
+    fi
 
-        # For each option in the array, reduce to short options for getopts (e.g. for [u]=user, --user will be -u)
-        # And built parameters string for getopts
-        # ${!args_array[@]} is the list of all option_flags in the array (An option_flag is 'u' in [u]=user, user is a value)
-        local getopts_parameters=""
-        local option_flag=""
-        for option_flag in "${!args_array[@]}"; do
-            # Concatenate each option_flags of the array to build the string of arguments for getopts
-            # Will looks like 'abcd' for -a -b -c -d
-            # If the value of an option_flag finish by =, it's an option with additionnal values. (e.g. --user bob or -u bob)
-            # Check the last character of the value associate to the option_flag
-            if [ "${args_array[$option_flag]: -1}" = "=" ]; then
-                # For an option with additionnal values, add a ':' after the letter for getopts.
-                getopts_parameters="${getopts_parameters}${option_flag}:"
-            else
-                getopts_parameters="${getopts_parameters}${option_flag}"
-            fi
-            # Check each argument given to the function
-            local arg=""
-            # ${#arguments[@]} is the size of the array
-            for arg in $(seq 0 $((${#arguments[@]} - 1))); do
-                # Escape options' values starting with -. Otherwise the - will be considered as another option.
-                arguments[arg]="${arguments[arg]//--${args_array[$option_flag]}-/--${args_array[$option_flag]}\\TOBEREMOVED\\-}"
-                # And replace long option (value of the option_flag) by the short option, the option_flag itself
-                # (e.g. for [u]=user, --user will be -u)
-                # Replace long option with = (match the beginning of the argument)
-                arguments[arg]="$(printf '%s\n' "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]}/-${option_flag} /")"
-                # And long option without = (match the whole line)
-                arguments[arg]="$(printf '%s\n' "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]%=}$/-${option_flag} /")"
-            done
+    # Store arguments in an array to keep each argument separated
+    local arguments=("$@")
+
+    # For each option in the array, reduce to short options for getopts (e.g. for [u]=user, --user will be -u)
+    # And built parameters string for getopts
+    # ${!args_array[@]} is the list of all option_flags in the array (An option_flag is 'u' in [u]=user, user is a value)
+    local getopts_parameters=""
+    local option_flag=""
+    for option_flag in "${!args_array[@]}"; do
+        # Concatenate each option_flags of the array to build the string of arguments for getopts
+        # Will looks like 'abcd' for -a -b -c -d
+        # If the value of an option_flag finish by =, it's an option with additionnal values. (e.g. --user bob or -u bob)
+        # Check the last character of the value associate to the option_flag
+        if [ "${args_array[$option_flag]: -1}" = "=" ]; then
+            # For an option with additionnal values, add a ':' after the letter for getopts.
+            getopts_parameters="${getopts_parameters}${option_flag}:"
+        else
+            getopts_parameters="${getopts_parameters}${option_flag}"
+        fi
+        # Check each argument given to the function
+        local arg=""
+        # ${#arguments[@]} is the size of the array
+        for arg in $(seq 0 $((${#arguments[@]} - 1))); do
+            # Escape options' values starting with -. Otherwise the - will be considered as another option.
+            arguments[arg]="${arguments[arg]//--${args_array[$option_flag]}-/--${args_array[$option_flag]}\\TOBEREMOVED\\-}"
+            # And replace long option (value of the option_flag) by the short option, the option_flag itself
+            # (e.g. for [u]=user, --user will be -u)
+            # Replace long option with = (match the beginning of the argument)
+            arguments[arg]="$(printf '%s\n' "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]}/-${option_flag} /")"
+            # And long option without = (match the whole line)
+            arguments[arg]="$(printf '%s\n' "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]%=}$/-${option_flag} /")"
         done
+    done
 
-        # Read and parse all the arguments
-        # Use a function here, to use standart arguments $@ and be able to use shift.
-        parse_arg() {
-            # Read all arguments, until no arguments are left
-            while [ $# -ne 0 ]; do
-                # Initialize the index of getopts
-                OPTIND=1
-                # Parse with getopts only if the argument begin by -, that means the argument is an option
-                # getopts will fill $parameter with the letter of the option it has read.
-                local parameter=""
-                getopts ":$getopts_parameters" parameter || true
+    # Read and parse all the arguments
+    # Use a function here, to use standart arguments $@ and be able to use shift.
+    parse_arg() {
+        # Read all arguments, until no arguments are left
+        while [ $# -ne 0 ]; do
+            # Initialize the index of getopts
+            OPTIND=1
+            # Parse with getopts only if the argument begin by -, that means the argument is an option
+            # getopts will fill $parameter with the letter of the option it has read.
+            local parameter=""
+            getopts ":$getopts_parameters" parameter || true
 
-                if [ "$parameter" = "?" ]; then
-                    ynh_die --message="Invalid argument: -${OPTARG:-}"
-                elif [ "$parameter" = ":" ]; then
-                    ynh_die --message="-$OPTARG parameter requires an argument."
-                else
-                    local shift_value=1
-                    # Use the long option, corresponding to the short option read by getopts, as a variable
-                    # (e.g. for [u]=user, 'user' will be used as a variable)
-                    # Also, remove '=' at the end of the long option
-                    # The variable name will be stored in 'option_var'
-                    local option_var="${args_array[$parameter]%=}"
-                    # If this option doesn't take values
-                    # if there's a '=' at the end of the long option name, this option takes values
-                    if [ "${args_array[$parameter]: -1}" != "=" ]; then
-                        # 'eval ${option_var}' will use the content of 'option_var'
-                        eval ${option_var}=1
-                    else
-                        # Read all other arguments to find multiple value for this option.
-                        # Load args in a array
-                        local all_args=("$@")
-
-                        # If the first argument is longer than 2 characters,
-                        # There's a value attached to the option, in the same array cell
-                        if [ ${#all_args[0]} -gt 2 ]; then
-                            # Remove the option and the space, so keep only the value itself.
-                            all_args[0]="${all_args[0]#-${parameter} }"
-
-                            # At this point, if all_args[0] start with "-", then the argument is not well formed
-                            if [ "${all_args[0]:0:1}" == "-" ]; then
-                                ynh_die --message="Argument \"${all_args[0]}\" not valid! Did you use a single \"-\" instead of two?"
-                            fi
-                            # Reduce the value of shift, because the option has been removed manually
-                            shift_value=$((shift_value - 1))
-                        fi
-
-                        # Declare the content of option_var as a variable.
-                        eval ${option_var}=""
-                        # Then read the array value per value
-                        local i
-                        for i in $(seq 0 $((${#all_args[@]} - 1))); do
-                            # If this argument is an option, end here.
-                            if [ "${all_args[$i]:0:1}" == "-" ]; then
-                                # Ignore the first value of the array, which is the option itself
-                                if [ "$i" -ne 0 ]; then
-                                    break
-                                fi
-                            else
-                                # Ignore empty parameters
-                                if [ -n "${all_args[$i]}" ]; then
-                                    # Else, add this value to this option
-                                    # Each value will be separated by ';'
-                                    if [ -n "${!option_var}" ]; then
-                                        # If there's already another value for this option, add a ; before adding the new value
-                                        eval ${option_var}+="\;"
-                                    fi
-
-                                    # Remove the \ that escape - at beginning of values.
-                                    all_args[i]="${all_args[i]//\\TOBEREMOVED\\/}"
-
-                                    # For the record.
-                                    # We're using eval here to get the content of the variable stored itself as simple text in $option_var...
-                                    # Other ways to get that content would be to use either ${!option_var} or declare -g ${option_var}
-                                    # But... ${!option_var} can't be used as left part of an assignation.
-                                    # declare -g ${option_var} will create a local variable (despite -g !) and will not be available for the helper itself.
-                                    # So... Stop fucking arguing each time that eval is evil... Go find an other working solution if you can find one!
-
-                                    eval ${option_var}+='"${all_args[$i]}"'
-                                fi
-                                shift_value=$((shift_value + 1))
-                            fi
-                        done
-                    fi
-                fi
-
-                # Shift the parameter and its argument(s)
-                shift $shift_value
-            done
-        }
-
-        # LEGACY MODE
-        # Check if there's getopts arguments
-        if [ "${arguments[0]:0:1}" != "-" ]; then
-            # If not, enter in legacy mode and manage the arguments as positionnal ones..
-            # Dot not echo, to prevent to go through a helper output. But print only in the log.
-            set -x
-            echo "! Helper used in legacy mode !" >/dev/null
-            set +x
-            local i
-            for i in $(seq 0 $((${#arguments[@]} - 1))); do
-                # Try to use legacy_args as a list of option_flag of the array args_array
-                # Otherwise, fallback to getopts_parameters to get the option_flag. But an associative arrays isn't always sorted in the correct order...
-                # Remove all ':' in getopts_parameters
-                getopts_parameters=${legacy_args:-${getopts_parameters//:/}}
-                # Get the option_flag from getopts_parameters, by using the option_flag according to the position of the argument.
-                option_flag=${getopts_parameters:$i:1}
-                if [ -z "$option_flag" ]; then
-                    ynh_print_warn --message="Too many arguments ! \"${arguments[$i]}\" will be ignored."
-                    continue
-                fi
-                # Use the long option, corresponding to the option_flag, as a variable
+            if [ "$parameter" = "?" ]; then
+                ynh_die --message="Invalid argument: -${OPTARG:-}"
+            elif [ "$parameter" = ":" ]; then
+                ynh_die --message="-$OPTARG parameter requires an argument."
+            else
+                local shift_value=1
+                # Use the long option, corresponding to the short option read by getopts, as a variable
                 # (e.g. for [u]=user, 'user' will be used as a variable)
                 # Also, remove '=' at the end of the long option
                 # The variable name will be stored in 'option_var'
-                local option_var="${args_array[$option_flag]%=}"
+                local option_var="${args_array[$parameter]%=}"
+                # If this option doesn't take values
+                # if there's a '=' at the end of the long option name, this option takes values
+                if [ "${args_array[$parameter]: -1}" != "=" ]; then
+                    # 'eval ${option_var}' will use the content of 'option_var'
+                    eval ${option_var}=1
+                else
+                    # Read all other arguments to find multiple value for this option.
+                    # Load args in a array
+                    local all_args=("$@")
 
-                # Store each value given as argument in the corresponding variable
-                # The values will be stored in the same order than $args_array
-                eval ${option_var}+='"${arguments[$i]}"'
-            done
-            unset legacy_args
-        else
-            # END LEGACY MODE
-            # Call parse_arg and pass the modified list of args as an array of arguments.
-            parse_arg "${arguments[@]}"
-        fi
-    fi
+                    # If the first argument is longer than 2 characters,
+                    # There's a value attached to the option, in the same array cell
+                    if [ ${#all_args[0]} -gt 2 ]; then
+                        # Remove the option and the space, so keep only the value itself.
+                        all_args[0]="${all_args[0]#-${parameter} }"
+
+                        # At this point, if all_args[0] start with "-", then the argument is not well formed
+                        if [ "${all_args[0]:0:1}" == "-" ]; then
+                            ynh_die --message="Argument \"${all_args[0]}\" not valid! Did you use a single \"-\" instead of two?"
+                        fi
+                        # Reduce the value of shift, because the option has been removed manually
+                        shift_value=$((shift_value - 1))
+                    fi
+
+                    # Declare the content of option_var as a variable.
+                    eval ${option_var}=""
+                    # Then read the array value per value
+                    local i
+                    for i in $(seq 0 $((${#all_args[@]} - 1))); do
+                        # If this argument is an option, end here.
+                        if [ "${all_args[$i]:0:1}" == "-" ]; then
+                            # Ignore the first value of the array, which is the option itself
+                            if [ "$i" -ne 0 ]; then
+                                break
+                            fi
+                        else
+                            # Ignore empty parameters
+                            if [ -n "${all_args[$i]}" ]; then
+                                # Else, add this value to this option
+                                # Each value will be separated by ';'
+                                if [ -n "${!option_var}" ]; then
+                                    # If there's already another value for this option, add a ; before adding the new value
+                                    eval ${option_var}+="\;"
+                                fi
+
+                                # Remove the \ that escape - at beginning of values.
+                                all_args[i]="${all_args[i]//\\TOBEREMOVED\\/}"
+
+                                # For the record.
+                                # We're using eval here to get the content of the variable stored itself as simple text in $option_var...
+                                # Other ways to get that content would be to use either ${!option_var} or declare -g ${option_var}
+                                # But... ${!option_var} can't be used as left part of an assignation.
+                                # declare -g ${option_var} will create a local variable (despite -g !) and will not be available for the helper itself.
+                                # So... Stop fucking arguing each time that eval is evil... Go find an other working solution if you can find one!
+
+                                eval ${option_var}+='"${all_args[$i]}"'
+                            fi
+                            shift_value=$((shift_value + 1))
+                        fi
+                    done
+                fi
+            fi
+
+            # Shift the parameter and its argument(s)
+            shift $shift_value
+        done
+    }
+
+    # Call parse_arg and pass the modified list of args as an array of arguments.
+    parse_arg "${arguments[@]}"
+    
     set -o xtrace # set -x
 }
diff --git a/helpers/helpers.v2.1.d/go b/helpers/helpers.v2.1.d/go
index 0e18301f7..c4b0643c8 100644
--- a/helpers/helpers.v2.1.d/go
+++ b/helpers/helpers.v2.1.d/go
@@ -95,7 +95,6 @@ ynh_use_go () {
 # Requires YunoHost version 3.2.2 or higher.
 ynh_install_go () {
     # Declare an array to define the options of this helper.
-    local legacy_args=v
     local -A args_array=( [v]=go_version= )
     local go_version
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/hardware b/helpers/helpers.v2.1.d/hardware
index 091f023f6..aed1a18ba 100644
--- a/helpers/helpers.v2.1.d/hardware
+++ b/helpers/helpers.v2.1.d/hardware
@@ -14,7 +14,6 @@
 # Requires YunoHost version 3.8.1 or higher.
 ynh_get_ram() {
     # Declare an array to define the options of this helper.
-    local legacy_args=ftso
     local -A args_array=([f]=free [t]=total [s]=ignore_swap [o]=only_swap)
     local free
     local total
@@ -78,7 +77,6 @@ ynh_get_ram() {
 # Requires YunoHost version 3.8.1 or higher.
 ynh_require_ram() {
     # Declare an array to define the options of this helper.
-    local legacy_args=rftso
     local -A args_array=([r]=required= [f]=free [t]=total [s]=ignore_swap [o]=only_swap)
     local required
     local free
diff --git a/helpers/helpers.v2.1.d/logging b/helpers/helpers.v2.1.d/logging
index accb8f9b0..d761a20e5 100644
--- a/helpers/helpers.v2.1.d/logging
+++ b/helpers/helpers.v2.1.d/logging
@@ -9,7 +9,6 @@
 # Requires YunoHost version 2.4.0 or higher.
 ynh_die() {
     # Declare an array to define the options of this helper.
-    local legacy_args=mc
     local -A args_array=([m]=message= [c]=ret_code=)
     local message
     local ret_code
@@ -29,7 +28,6 @@ ynh_die() {
 # Requires YunoHost version 3.2.0 or higher.
 ynh_print_info() {
     # Declare an array to define the options of this helper.
-    local legacy_args=m
     local -A args_array=([m]=message=)
     local message
     # Manage arguments with getopts
@@ -55,7 +53,6 @@ ynh_print_log() {
 # Requires YunoHost version 3.2.0 or higher.
 ynh_print_warn() {
     # Declare an array to define the options of this helper.
-    local legacy_args=m
     local -A args_array=([m]=message=)
     local message
     # Manage arguments with getopts
@@ -72,7 +69,6 @@ ynh_print_warn() {
 # Requires YunoHost version 3.2.0 or higher.
 ynh_print_err() {
     # Declare an array to define the options of this helper.
-    local legacy_args=m
     local -A args_array=([m]=message=)
     local message
     # Manage arguments with getopts
@@ -201,7 +197,7 @@ ynh_exec_and_print_stderr_only_if_error() {
     "$@" 2> "$logfile" || rc="$?"
     if (( rc != 0 )); then
         ynh_exec_warn cat "$logfile"
-        ynh_secure_remove "$logfile"
+        ynh_secure_remove --file="$logfile"
         return "$rc"
     fi
 }
@@ -257,7 +253,6 @@ base_time=$(date +%s)
 ynh_script_progression() {
     set +o xtrace # set +x
     # Declare an array to define the options of this helper.
-    local legacy_args=mwtl
     local -A args_array=([m]=message= [w]=weight= [t]=time [l]=last)
     local message
     local weight
@@ -332,7 +327,7 @@ ynh_script_progression() {
         print_exec_time=" [$(bc <<< "scale=1; $exec_time / 60" ) minutes]"
     fi
 
-    ynh_print_info "[$progression_bar] > ${message}${print_exec_time}"
+    echo "[$progression_bar] > ${message}${print_exec_time}" >&$YNH_STDINFO
     set -o xtrace # set -x
 }
 
diff --git a/helpers/helpers.v2.1.d/logrotate b/helpers/helpers.v2.1.d/logrotate
index efc1137c1..4f5cb69e9 100644
--- a/helpers/helpers.v2.1.d/logrotate
+++ b/helpers/helpers.v2.1.d/logrotate
@@ -27,7 +27,6 @@ ynh_use_logrotate() {
     set -- "${all_args[@]}"
 
     # Argument parsing
-    local legacy_args=lu
     local -A args_array=([l]=logfile= [u]=specific_user=)
     local logfile
     local specific_user
diff --git a/helpers/helpers.v2.1.d/mongodb b/helpers/helpers.v2.1.d/mongodb
index d40d11bfe..c8b016e1b 100644
--- a/helpers/helpers.v2.1.d/mongodb
+++ b/helpers/helpers.v2.1.d/mongodb
@@ -18,7 +18,6 @@
 #
 ynh_mongo_exec() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=upadhPce
 	local -A args_array=( [u]=user= [p]=password= [a]=authenticationdatabase= [d]=database= [h]=host= [P]=port= [c]=command= [e]=eval )
 	local user
 	local password
@@ -115,7 +114,6 @@ EOF
 #
 ynh_mongo_drop_db() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=d
 	local -A args_array=( [d]=database= )
 	local database
 	# Manage arguments with getopts
@@ -135,7 +133,6 @@ ynh_mongo_drop_db() {
 #
 ynh_mongo_dump_db() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=d
 	local -A args_array=( [d]=database= )
 	local database
 	# Manage arguments with getopts
@@ -156,7 +153,6 @@ ynh_mongo_dump_db() {
 #
 ynh_mongo_create_user() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=unp
 	local -A args_array=( [u]=db_user= [n]=db_name= [p]=db_pwd= )
 	local db_user
 	local db_name
@@ -180,7 +176,6 @@ ynh_mongo_create_user() {
 #
 ynh_mongo_database_exists() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=d
 	local -A args_array=([d]=database=)
 	local database
 	# Manage arguments with getopts
@@ -204,7 +199,6 @@ ynh_mongo_database_exists() {
 #
 ynh_mongo_restore_db() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=d
 	local -A args_array=( [d]=database= )
 	local database
 	# Manage arguments with getopts
@@ -224,7 +218,6 @@ ynh_mongo_restore_db() {
 #
 ynh_mongo_drop_user() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=un
 	local -A args_array=( [u]=db_user= [n]=db_name= )
 	local db_user
 	local db_name
@@ -247,7 +240,6 @@ ynh_mongo_drop_user() {
 #
 ynh_mongo_setup_db() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=unp
 	local -A args_array=( [u]=db_user= [n]=db_name= [p]=db_pwd= )
 	local db_user
 	local db_name
@@ -275,7 +267,6 @@ ynh_mongo_setup_db() {
 #
 ynh_mongo_remove_db() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=un
 	local -A args_array=( [u]=db_user= [n]=db_name= )
 	local db_user
 	local db_name
@@ -300,7 +291,6 @@ ynh_mongo_remove_db() {
 #
 ynh_install_mongo() {
 	# Declare an array to define the options of this helper.
-	local legacy_args=m
 	local -A args_array=([m]=mongo_version=)
 	local mongo_version
 	# Manage arguments with getopts
@@ -343,7 +333,7 @@ ynh_install_mongo() {
 #
 ynh_remove_mongo() {
 	# Only remove the mongodb service if it is not installed.
-	if ! ynh_package_is_installed --package="mongodb*"
+	if ! ynh_package_is_installed "mongodb*"
 	then
 		ynh_print_info --message="Removing MongoDB service..."
 		mongodb_servicename=mongod
diff --git a/helpers/helpers.v2.1.d/multimedia b/helpers/helpers.v2.1.d/multimedia
index c860ae49f..b1d8a526e 100644
--- a/helpers/helpers.v2.1.d/multimedia
+++ b/helpers/helpers.v2.1.d/multimedia
@@ -64,7 +64,6 @@ ynh_multimedia_build_main_dir() {
 ynh_multimedia_addfolder() {
 
     # Declare an array to define the options of this helper.
-    local legacy_args=sd
     local -A args_array=([s]=source_dir= [d]=dest_dir=)
     local source_dir
     local dest_dir
@@ -92,7 +91,6 @@ ynh_multimedia_addfolder() {
 # Requires YunoHost version 4.2 or higher.
 ynh_multimedia_addaccess() {
     # Declare an array to define the options of this helper.
-    local legacy_args=u
     declare -Ar args_array=([u]=user_name=)
     local user_name
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/mysql b/helpers/helpers.v2.1.d/mysql
index 6e0ab4a02..7b7e0fd31 100644
--- a/helpers/helpers.v2.1.d/mysql
+++ b/helpers/helpers.v2.1.d/mysql
@@ -14,7 +14,6 @@
 # Requires YunoHost version 2.2.4 or higher.
 ynh_mysql_connect_as() {
     # Declare an array to define the options of this helper.
-    local legacy_args=upd
     local -A args_array=([u]=user= [p]=password= [d]=database=)
     local user
     local password
@@ -35,7 +34,6 @@ ynh_mysql_connect_as() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_mysql_execute_as_root() {
     # Declare an array to define the options of this helper.
-    local legacy_args=sd
     local -A args_array=([s]=sql= [d]=database=)
     local sql
     local database
@@ -59,7 +57,6 @@ ynh_mysql_execute_as_root() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_mysql_execute_file_as_root() {
     # Declare an array to define the options of this helper.
-    local legacy_args=fd
     local -A args_array=([f]=file= [d]=database=)
     local file
     local database
@@ -127,7 +124,6 @@ ynh_mysql_drop_db() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_mysql_dump_db() {
     # Declare an array to define the options of this helper.
-    local legacy_args=d
     local -A args_array=([d]=database=)
     local database
     # Manage arguments with getopts
@@ -161,7 +157,6 @@ ynh_mysql_create_user() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_mysql_user_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=u
     local -A args_array=([u]=user=)
     local user
     # Manage arguments with getopts
@@ -201,7 +196,6 @@ ynh_mysql_drop_user() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_mysql_setup_db() {
     # Declare an array to define the options of this helper.
-    local legacy_args=unp
     local -A args_array=([u]=db_user= [n]=db_name= [p]=db_pwd=)
     local db_user
     local db_name
@@ -215,7 +209,7 @@ ynh_mysql_setup_db() {
     db_pwd="${db_pwd:-$new_db_pwd}"
 
     # Dirty patch for super-legacy apps
-    dpkg --list | grep -q "^ii  mariadb-server" || { ynh_print_warn "Packager: you called ynh_mysql_setup_db without declaring a dependency to mariadb-server. Please add it to your apt dependencies !"; ynh_apt install mariadb-server; }
+    dpkg --list | grep -q "^ii  mariadb-server" || { ynh_print_warn --message="Packager: you called ynh_mysql_setup_db without declaring a dependency to mariadb-server. Please add it to your apt dependencies !"; ynh_apt install mariadb-server; }
 
     ynh_mysql_create_db "$db_name" "$db_user" "$db_pwd"
     ynh_app_setting_set --app=$app --key=mysqlpwd --value=$db_pwd
@@ -232,7 +226,6 @@ ynh_mysql_setup_db() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_mysql_remove_db() {
     # Declare an array to define the options of this helper.
-    local legacy_args=un
     local -Ar args_array=([u]=db_user= [n]=db_name=)
     local db_user
     local db_name
diff --git a/helpers/helpers.v2.1.d/network b/helpers/helpers.v2.1.d/network
index bed9dd402..c407af512 100644
--- a/helpers/helpers.v2.1.d/network
+++ b/helpers/helpers.v2.1.d/network
@@ -13,7 +13,6 @@
 # Requires YunoHost version 2.6.4 or higher.
 ynh_find_port() {
     # Declare an array to define the options of this helper.
-    local legacy_args=p
     local -A args_array=([p]=port=)
     local port
     # Manage arguments with getopts
@@ -39,7 +38,6 @@ ynh_find_port() {
 # Requires YunoHost version 3.8.0 or higher.
 ynh_port_available() {
     # Declare an array to define the options of this helper.
-    local legacy_args=p
     local -A args_array=([p]=port=)
     local port
     # Manage arguments with getopts
@@ -70,7 +68,6 @@ ynh_validate_ip() {
     # http://stackoverflow.com/questions/319279/how-to-validate-ip-address-in-python#319298
 
     # Declare an array to define the options of this helper.
-    local legacy_args=fi
     local -A args_array=([f]=family= [i]=ip_address=)
     local family
     local ip_address
@@ -102,7 +99,6 @@ EOF
 # Requires YunoHost version 2.2.4 or higher.
 ynh_validate_ip4() {
     # Declare an array to define the options of this helper.
-    local legacy_args=i
     local -A args_array=([i]=ip_address=)
     local ip_address
     # Manage arguments with getopts
@@ -122,7 +118,6 @@ ynh_validate_ip4() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_validate_ip6() {
     # Declare an array to define the options of this helper.
-    local legacy_args=i
     local -A args_array=([i]=ip_address=)
     local ip_address
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/nodejs b/helpers/helpers.v2.1.d/nodejs
index 779f077d0..4bf9a0b71 100644
--- a/helpers/helpers.v2.1.d/nodejs
+++ b/helpers/helpers.v2.1.d/nodejs
@@ -95,7 +95,6 @@ ynh_install_nodejs() {
     # Use n, https://github.com/tj/n to manage the nodejs versions
 
     # Declare an array to define the options of this helper.
-    local legacy_args=n
     local -A args_array=([n]=nodejs_version=)
     local nodejs_version
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/permission b/helpers/helpers.v2.1.d/permission
index d3eb71c22..bf2ca86ed 100644
--- a/helpers/helpers.v2.1.d/permission
+++ b/helpers/helpers.v2.1.d/permission
@@ -67,7 +67,6 @@
 # Requires YunoHost version 3.7.0 or higher.
 ynh_permission_create() {
     # Declare an array to define the options of this helper.
-    local legacy_args=puAhaltP
     local -A args_array=([p]=permission= [u]=url= [A]=additional_urls= [h]=auth_header= [a]=allowed= [l]=label= [t]=show_tile= [P]=protected=)
     local permission
     local url
@@ -155,7 +154,6 @@ ynh_permission_create() {
 # Requires YunoHost version 3.7.0 or higher.
 ynh_permission_delete() {
     # Declare an array to define the options of this helper.
-    local legacy_args=p
     local -A args_array=([p]=permission=)
     local permission
     ynh_handle_getopts_args "$@"
@@ -174,7 +172,6 @@ ynh_permission_delete() {
 # Requires YunoHost version 3.7.0 or higher.
 ynh_permission_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=p
     local -A args_array=([p]=permission=)
     local permission
     ynh_handle_getopts_args "$@"
@@ -199,7 +196,6 @@ ynh_permission_exists() {
 # Requires YunoHost version 3.7.0 or higher.
 ynh_permission_url() {
     # Declare an array to define the options of this helper.
-    local legacy_args=puarhc
     local -A args_array=([p]=permission= [u]=url= [a]=add_url= [r]=remove_url= [h]=auth_header= [c]=clear_urls)
     local permission
     local url
@@ -269,7 +265,6 @@ ynh_permission_url() {
 # Requires YunoHost version 3.7.0 or higher.
 ynh_permission_update() {
     # Declare an array to define the options of this helper.
-    local legacy_args=parltP
     local -A args_array=([p]=permission= [a]=add= [r]=remove= [l]=label= [t]=show_tile= [P]=protected=)
     local permission
     local add
@@ -337,7 +332,6 @@ ynh_permission_update() {
 #
 # Requires YunoHost version 3.7.1 or higher.
 ynh_permission_has_user() {
-    local legacy_args=pu
     # Declare an array to define the options of this helper.
     local -A args_array=([p]=permission= [u]=user=)
     local permission
diff --git a/helpers/helpers.v2.1.d/php b/helpers/helpers.v2.1.d/php
index 45e106a1b..52100560d 100644
--- a/helpers/helpers.v2.1.d/php
+++ b/helpers/helpers.v2.1.d/php
@@ -70,7 +70,6 @@ YNH_PHP_VERSION=${YNH_PHP_VERSION:-$YNH_DEFAULT_PHP_VERSION}
 ynh_add_fpm_config() {
     local _globalphpversion=${phpversion-:}
     # Declare an array to define the options of this helper.
-    local legacy_args=vufg
     local -A args_array=([v]=phpversion= [u]=usage= [f]=footprint= [g]=group=)
     local group
     local phpversion
@@ -243,7 +242,6 @@ ynh_remove_fpm_config() {
 #
 # | arg: -p, --print            - Print the result (intended for debug purpose only when packaging the app)
 ynh_get_scalable_phpfpm() {
-    local legacy_args=ufp
     # Declare an array to define the options of this helper.
     local -A args_array=([u]=usage= [f]=footprint= [p]=print)
     local usage
@@ -376,7 +374,6 @@ YNH_COMPOSER_VERSION=${YNH_COMPOSER_VERSION:-$YNH_DEFAULT_COMPOSER_VERSION}
 ynh_composer_exec() {
     local _globalphpversion=${phpversion-:}
     # Declare an array to define the options of this helper.
-    local legacy_args=vwc
     declare -Ar args_array=([v]=phpversion= [w]=workdir= [c]=commands=)
     local phpversion
     local workdir
@@ -408,7 +405,6 @@ ynh_composer_exec() {
 ynh_install_composer() {
     local _globalphpversion=${phpversion-:}
     # Declare an array to define the options of this helper.
-    local legacy_args=vwac
     declare -Ar args_array=([v]=phpversion= [w]=workdir= [a]=install_args= [c]=composerversion=)
     local phpversion
     local workdir
diff --git a/helpers/helpers.v2.1.d/postgresql b/helpers/helpers.v2.1.d/postgresql
index 35b95cd5f..09c906cb6 100644
--- a/helpers/helpers.v2.1.d/postgresql
+++ b/helpers/helpers.v2.1.d/postgresql
@@ -17,7 +17,6 @@ PSQL_VERSION=13
 # Requires YunoHost version 3.5.0 or higher.
 ynh_psql_connect_as() {
     # Declare an array to define the options of this helper.
-    local legacy_args=upd
     local -A args_array=([u]=user= [p]=password= [d]=database=)
     local user
     local password
@@ -38,7 +37,6 @@ ynh_psql_connect_as() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_psql_execute_as_root() {
     # Declare an array to define the options of this helper.
-    local legacy_args=sd
     local -A args_array=([s]=sql= [d]=database=)
     local sql
     local database
@@ -63,7 +61,6 @@ ynh_psql_execute_as_root() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_psql_execute_file_as_root() {
     # Declare an array to define the options of this helper.
-    local legacy_args=fd
     local -A args_array=([f]=file= [d]=database=)
     local file
     local database
@@ -134,7 +131,6 @@ ynh_psql_drop_db() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_psql_dump_db() {
     # Declare an array to define the options of this helper.
-    local legacy_args=d
     local -A args_array=([d]=database=)
     local database
     # Manage arguments with getopts
@@ -169,7 +165,6 @@ ynh_psql_create_user() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_psql_user_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=u
     local -A args_array=([u]=user=)
     local user
     # Manage arguments with getopts
@@ -191,7 +186,6 @@ ynh_psql_user_exists() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_psql_database_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=d
     local -A args_array=([d]=database=)
     local database
     # Manage arguments with getopts
@@ -201,7 +195,7 @@ ynh_psql_database_exists() {
     # though it could exists.
     if ! command -v psql
     then
-      ynh_print_err -m "PostgreSQL is not installed, impossible to check for db existence."
+      ynh_print_err --message="PostgreSQL is not installed, impossible to check for db existence."
       return 1
     elif ! sudo --login --user=postgres PGUSER="postgres" PGPASSWORD="$(cat $PSQL_ROOT_PWD_FILE)" psql -tAc "SELECT datname FROM pg_database WHERE datname='$database';" | grep --quiet "$database"; then
         return 1
@@ -237,7 +231,6 @@ ynh_psql_drop_user() {
 # Requires YunoHost version 2.7.13 or higher.
 ynh_psql_setup_db() {
     # Declare an array to define the options of this helper.
-    local legacy_args=unp
     local -A args_array=([u]=db_user= [n]=db_name= [p]=db_pwd=)
     local db_user
     local db_name
@@ -270,7 +263,6 @@ ynh_psql_setup_db() {
 # Requires YunoHost version 2.7.13 or higher.
 ynh_psql_remove_db() {
     # Declare an array to define the options of this helper.
-    local legacy_args=un
     local -A args_array=([u]=db_user= [n]=db_name=)
     local db_user
     local db_name
diff --git a/helpers/helpers.v2.1.d/ruby b/helpers/helpers.v2.1.d/ruby
index 82a946935..10e450ed9 100644
--- a/helpers/helpers.v2.1.d/ruby
+++ b/helpers/helpers.v2.1.d/ruby
@@ -97,7 +97,6 @@ ynh_use_ruby () {
 # Requires YunoHost version 3.2.2 or higher.
 ynh_install_ruby () {
     # Declare an array to define the options of this helper.
-    local legacy_args=v
     local -A args_array=( [v]=ruby_version= )
     local ruby_version
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/setting b/helpers/helpers.v2.1.d/setting
index 3ddb26851..bd9aa2ab4 100644
--- a/helpers/helpers.v2.1.d/setting
+++ b/helpers/helpers.v2.1.d/setting
@@ -10,7 +10,6 @@
 ynh_app_setting_get() {
     local _globalapp=${app-:}
     # Declare an array to define the options of this helper.
-    local legacy_args=ak
     local -A args_array=([a]=app= [k]=key=)
     local app
     local key
@@ -32,7 +31,6 @@ ynh_app_setting_get() {
 ynh_app_setting_set() {
     local _globalapp=${app-:}
     # Declare an array to define the options of this helper.
-    local legacy_args=akv
     local -A args_array=([a]=app= [k]=key= [v]=value=)
     local app
     local key
@@ -54,7 +52,6 @@ ynh_app_setting_set() {
 ynh_app_setting_delete() {
     local _globalapp=${app-:}
     # Declare an array to define the options of this helper.
-    local legacy_args=ak
     local -A args_array=([a]=app= [k]=key=)
     local app
     local key
@@ -112,7 +109,6 @@ EOF
 # Requires YunoHost version 2.6.4 or higher.
 ynh_webpath_available() {
     # Declare an array to define the options of this helper.
-    local legacy_args=dp
     local -A args_array=([d]=domain= [p]=path_url=)
     local domain
     local path_url
@@ -136,7 +132,6 @@ ynh_webpath_available() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_webpath_register() {
     # Declare an array to define the options of this helper.
-    local legacy_args=adp
     local -A args_array=([a]=app= [d]=domain= [p]=path_url=)
     local app
     local domain
diff --git a/helpers/helpers.v2.1.d/string b/helpers/helpers.v2.1.d/string
index b674d9a4a..f022deab2 100644
--- a/helpers/helpers.v2.1.d/string
+++ b/helpers/helpers.v2.1.d/string
@@ -12,7 +12,6 @@
 # Requires YunoHost version 2.2.4 or higher.
 ynh_string_random() {
     # Declare an array to define the options of this helper.
-    local legacy_args=lf
     local -A args_array=([l]=length= [f]=filter=)
     local length
     local filter
@@ -39,7 +38,6 @@ ynh_string_random() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_replace_string() {
     # Declare an array to define the options of this helper.
-    local legacy_args=mrf
     local -A args_array=([m]=match_string= [r]=replace_string= [f]=target_file=)
     local match_string
     local replace_string
@@ -70,7 +68,6 @@ ynh_replace_string() {
 # Requires YunoHost version 2.7.7 or higher.
 ynh_replace_special_string() {
     # Declare an array to define the options of this helper.
-    local legacy_args=mrf
     local -A args_array=([m]=match_string= [r]=replace_string= [f]=target_file=)
     local match_string
     local replace_string
@@ -104,7 +101,6 @@ ynh_replace_special_string() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_sanitize_dbid() {
     # Declare an array to define the options of this helper.
-    local legacy_args=n
     local -A args_array=([n]=db_name=)
     local db_name
     # Manage arguments with getopts
@@ -134,7 +130,6 @@ ynh_sanitize_dbid() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_normalize_url_path() {
     # Declare an array to define the options of this helper.
-    local legacy_args=p
     local -A args_array=([p]=path_url=)
     local path_url
     # Manage arguments with getopts
diff --git a/helpers/helpers.v2.1.d/systemd b/helpers/helpers.v2.1.d/systemd
index 765c575ef..57d6b3802 100644
--- a/helpers/helpers.v2.1.d/systemd
+++ b/helpers/helpers.v2.1.d/systemd
@@ -14,7 +14,6 @@
 # Requires YunoHost version 4.1.0 or higher.
 ynh_add_systemd_config() {
     # Declare an array to define the options of this helper.
-    local legacy_args=stv
     local -A args_array=([s]=service= [t]=template=)
     local service
     local template
@@ -37,7 +36,6 @@ ynh_add_systemd_config() {
 # Requires YunoHost version 2.7.2 or higher.
 ynh_remove_systemd_config() {
     # Declare an array to define the options of this helper.
-    local legacy_args=s
     local -A args_array=([s]=service=)
     local service
     # Manage arguments with getopts
@@ -66,7 +64,6 @@ ynh_remove_systemd_config() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_systemd_action() {
     # Declare an array to define the options of this helper.
-    local legacy_args=nalpte
     local -A args_array=([n]=service_name= [a]=action= [l]=line_match= [p]=log_path= [t]=timeout= [e]=length=)
     local service_name
     local action
diff --git a/helpers/helpers.v2.1.d/user b/helpers/helpers.v2.1.d/user
index e608a3308..14a8e32b5 100644
--- a/helpers/helpers.v2.1.d/user
+++ b/helpers/helpers.v2.1.d/user
@@ -11,7 +11,6 @@
 # Requires YunoHost version 2.2.4 or higher.
 ynh_user_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=u
     local -A args_array=([u]=username=)
     local username
     # Manage arguments with getopts
@@ -32,7 +31,6 @@ ynh_user_exists() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_user_get_info() {
     # Declare an array to define the options of this helper.
-    local legacy_args=uk
     local -A args_array=([u]=username= [k]=key=)
     local username
     local key
@@ -65,7 +63,6 @@ ynh_user_list() {
 # Requires YunoHost version 2.2.4 or higher.
 ynh_system_user_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=u
     local -A args_array=([u]=username=)
     local username
     # Manage arguments with getopts
@@ -85,7 +82,6 @@ ynh_system_user_exists() {
 # Requires YunoHost version 3.5.0.2 or higher.
 ynh_system_group_exists() {
     # Declare an array to define the options of this helper.
-    local legacy_args=g
     local -A args_array=([g]=group=)
     local group
     # Manage arguments with getopts
@@ -116,7 +112,6 @@ ynh_system_group_exists() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_system_user_create() {
     # Declare an array to define the options of this helper.
-    local legacy_args=uhs
     local -A args_array=([u]=username= [h]=home_dir= [s]=use_shell [g]=groups=)
     local username
     local home_dir
@@ -129,7 +124,7 @@ ynh_system_user_create() {
     home_dir="${home_dir:-}"
     groups="${groups:-}"
 
-    if ! ynh_system_user_exists "$username"; then # Check if the user exists on the system
+    if ! ynh_system_user_exists --username="$username"; then # Check if the user exists on the system
         # If the user doesn't exist
         if [ -n "$home_dir" ]; then # If a home dir is mentioned
             local user_home_dir="--home-dir $home_dir"
@@ -160,21 +155,20 @@ ynh_system_user_create() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_system_user_delete() {
     # Declare an array to define the options of this helper.
-    local legacy_args=u
     local -A args_array=([u]=username=)
     local username
     # Manage arguments with getopts
     ynh_handle_getopts_args "$@"
 
     # Check if the user exists on the system
-    if ynh_system_user_exists "$username"; then
+    if ynh_system_user_exists --username="$username"; then
         deluser $username
     else
         ynh_print_warn --message="The user $username was not found"
     fi
 
     # Check if the group exists on the system
-    if ynh_system_group_exists "$username"; then
+    if ynh_system_group_exists --group="$username"; then
         delgroup $username
     fi
 }
diff --git a/helpers/helpers.v2.1.d/utils b/helpers/helpers.v2.1.d/utils
index 9131c2378..6431ccbfb 100644
--- a/helpers/helpers.v2.1.d/utils
+++ b/helpers/helpers.v2.1.d/utils
@@ -155,7 +155,6 @@ fi
 # Requires YunoHost version 2.6.4 or higher.
 ynh_setup_source() {
     # Declare an array to define the options of this helper.
-    local legacy_args=dsk
     local -A args_array=([d]=dest_dir= [s]=source_id= [k]=keep= [r]=full_replace=)
     local dest_dir
     local source_id
@@ -186,8 +185,8 @@ ynh_setup_source() {
         local src_platform="$(jq -r ".platform" <<< "$sources_json" | sed 's/^null$//')"
         local src_rename="$(jq -r ".rename" <<< "$sources_json" | sed 's/^null$//')"
 
-        [[ -n "$src_url" ]] || ynh_die "No URL defined for source $source_id$arch_prefix ?"
-        [[ -n "$src_sum" ]] || ynh_die "No sha256 sum defined for source $source_id$arch_prefix ?"
+        [[ -n "$src_url" ]] || ynh_die --message="No URL defined for source $source_id$arch_prefix ?"
+        [[ -n "$src_sum" ]] || ynh_die --message="No sha256 sum defined for source $source_id$arch_prefix ?"
 
         if [[ -z "$src_format" ]]
         then
@@ -233,7 +232,7 @@ ynh_setup_source() {
 
     if [[ "$src_extract" != "true" ]] && [[ "$src_extract" != "false" ]]
     then
-        ynh_die "For source $source_id, expected either 'true' or 'false' for the extract parameter"
+        ynh_die --message="For source $source_id, expected either 'true' or 'false' for the extract parameter"
     fi
 
 
@@ -251,7 +250,7 @@ ynh_setup_source() {
             cp $local_src $src_filename
         fi
 
-        [ -n "$src_url" ] || ynh_die "Couldn't parse SOURCE_URL from $src_file_path ?"
+        [ -n "$src_url" ] || ynh_die --message="Couldn't parse SOURCE_URL from $src_file_path ?"
 
         # If the file was prefetched but somehow doesn't match the sum, rm and redownload it
         if [ -e "$src_filename" ] && ! echo "${src_sum} ${src_filename}" | ${src_sumprg} --check --status
@@ -436,14 +435,14 @@ ynh_local_curl() {
     # Temporarily enable visitors if needed...
     local visitors_enabled=$(ynh_permission_has_user "main" "visitors" && echo yes || echo no)
     if [[ $visitors_enabled == "no" ]]; then
-        ynh_permission_update --permission "main" --add "visitors"
+        ynh_permission_update --permission="main" --add="visitors"
     fi
 
     # Curl the URL
     curl --silent --show-error --insecure --location --header "Host: $domain" --resolve $domain:443:127.0.0.1 $POST_data "$full_page_url" --cookie-jar $cookiefile --cookie $cookiefile
 
     if [[ $visitors_enabled == "no" ]]; then
-        ynh_permission_update --permission "main" --remove "visitors"
+        ynh_permission_update --permission="main" --remove="visitors"
     fi
 }
 
@@ -489,7 +488,6 @@ ynh_local_curl() {
 # Requires YunoHost version 4.1.0 or higher.
 ynh_add_config() {
     # Declare an array to define the options of this helper.
-    local legacy_args=tdv
     local -A args_array=([t]=template= [d]=destination=)
     local template
     local destination
@@ -550,7 +548,6 @@ ynh_add_config() {
 # Requires YunoHost version 4.1.0 or higher.
 ynh_replace_vars() {
     # Declare an array to define the options of this helper.
-    local legacy_args=f
     local -A args_array=([f]=file=)
     local file
     # Manage arguments with getopts
@@ -647,7 +644,6 @@ ynh_replace_vars() {
 # Requires YunoHost version 4.3 or higher.
 ynh_read_var_in_file() {
     # Declare an array to define the options of this helper.
-    local legacy_args=fka
     local -A args_array=([f]=file= [k]=key= [a]=after=)
     local file
     local key
@@ -725,7 +721,6 @@ ynh_read_var_in_file() {
 # Requires YunoHost version 4.3 or higher.
 ynh_write_var_in_file() {
     # Declare an array to define the options of this helper.
-    local legacy_args=fkva
     local -A args_array=([f]=file= [k]=key= [v]=value= [a]=after=)
     local file
     local key
@@ -873,7 +868,6 @@ _acceptable_path_to_delete() {
 # Requires YunoHost version 2.6.4 or higher.
 ynh_secure_remove() {
     # Declare an array to define the options of this helper.
-    local legacy_args=f
     local -A args_array=([f]=file=)
     local file
     # Manage arguments with getopts
@@ -907,7 +901,6 @@ ynh_secure_remove() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_read_manifest() {
     # Declare an array to define the options of this helper.
-    local legacy_args=mk
     local -A args_array=([m]=manifest= [k]=manifest_key=)
     local manifest
     local manifest_key
@@ -923,7 +916,7 @@ ynh_read_manifest() {
         then
             manifest="$YNH_APP_BASEDIR/manifest.toml"
         else
-            ynh_die --message "No manifest found !?"
+            ynh_die --message="No manifest found !?"
         fi
     fi
 
@@ -950,7 +943,6 @@ ynh_read_manifest() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_app_upstream_version() {
     # Declare an array to define the options of this helper.
-    local legacy_args=m
     local -A args_array=([m]=manifest=)
     local manifest
     # Manage arguments with getopts
@@ -981,7 +973,6 @@ ynh_app_upstream_version() {
 # Requires YunoHost version 3.5.0 or higher.
 ynh_app_package_version() {
     # Declare an array to define the options of this helper.
-    local legacy_args=m
     local -A args_array=([m]=manifest=)
     local manifest
     # Manage arguments with getopts
@@ -1031,7 +1022,6 @@ ynh_check_app_version_changed() {
 #
 # Requires YunoHost version 3.8.0 or higher.
 ynh_compare_current_package_version() {
-    local legacy_args=cv
     declare -Ar args_array=([c]=comparison= [v]=version=)
     local version
     local comparison
@@ -1077,7 +1067,7 @@ _ynh_apply_default_permissions() {
     chmod o-rwx $target
     chmod g-w $target
     chown -R root:root $target
-    if ynh_system_user_exists $app; then
+    if ynh_system_user_exists --username=$app; then
         chown $app:$app $target
     fi