diff --git a/scripts/_common.sh b/scripts/_common.sh
index f5eaf6d..982e7fc 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -3,4 +3,9 @@
 #=================================================
 # CONSTANTS
 #=================================================
-pkg_dependencies="diffutils imagemagick acl"
+# shellcheck disable=SC2034 # Variable is used by other scripts
+pkg_dependencies=(
+    diffutils
+    imagemagick
+    acl
+)
diff --git a/scripts/backup b/scripts/backup
index 3c7d1a7..1f73a36 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -24,10 +24,10 @@ ynh_script_progression --message="Loading installation settings..." --weight=1
 
 app=$YNH_APP_INSTANCE_NAME
 
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
+final_path=$(ynh_app_setting_get --app="$app" --key=final_path)
+domain=$(ynh_app_setting_get --app="$app" --key=domain)
+db_name=$(ynh_app_setting_get --app="$app" --key=db_name)
+phpversion=$(ynh_app_setting_get --app="$app" --key=phpversion)
 
 #=================================================
 # STANDARD BACKUP STEPS
diff --git a/scripts/change_url b/scripts/change_url
index c66a616..a51f1c7 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -36,7 +36,7 @@ old_path=$(ynh_normalize_url_path $old_path)
 ynh_script_progression --message="Loading installation settings..." --weight=1
 
 # Needed for helper "ynh_add_nginx_config"
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+final_path=$(ynh_app_setting_get --app="$app" --key=final_path)
 
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
@@ -86,7 +86,9 @@ then
 	# Make a backup of the original nginx config file if modified
   ynh_backup_if_checksum_is_different --file="$nginx_conf_path"
 	# Set global variables for nginx helper
+  # shellcheck disable=SC2034 # Variable is referenced by ynh_add_nginx_config
   domain="$old_domain"
+  # shellcheck disable=SC2034 # Variable is referenced by ynh_add_nginx_config
   path_url="$new_path"
 	# Create a dedicated nginx config
   ynh_add_nginx_config
@@ -97,7 +99,7 @@ if [ $change_domain -eq 1 ]
 then
 	# Delete file checksum for the old conf file location
   ynh_delete_file_checksum --file="$nginx_conf_path"
-  mv $nginx_conf_path /etc/nginx/conf.d/$new_domain.d/$app.conf
+  mv "$nginx_conf_path" "/etc/nginx/conf.d/$new_domain.d/$app.conf"
 	# Store file checksum for the new config file location
   ynh_store_file_checksum --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
 fi
diff --git a/scripts/install b/scripts/install
index 4872a81..364de93 100755
--- a/scripts/install
+++ b/scripts/install
@@ -21,7 +21,7 @@ ynh_abort_if_errors
 #=================================================
 
 domain=$YNH_APP_ARG_DOMAIN
-path_url=$(ynh_normalize_url_path $YNH_APP_ARG_PATH)
+path_url=$(ynh_normalize_url_path "$YNH_APP_ARG_PATH")
 admin=$YNH_APP_ARG_ADMIN
 admin_password=$YNH_APP_ARG_PASSWORD
 is_public=$YNH_APP_ARG_IS_PUBLIC
@@ -39,7 +39,7 @@ final_path=/var/www/$app
 test ! -e "$final_path" || ynh_die --message="This path already contains a folder"
 
 # Register (book) web path
-ynh_webpath_register --app=$app --domain=$domain --path_url=$path_url
+ynh_webpath_register --app="$app" --domain="$domain" --path_url="$path_url"
 
 #=================================================
 # GENERATE LDAP USER SETTINGS
@@ -54,15 +54,15 @@ ldap_password=$(ynh_string_random --length=8)
 #=================================================
 ynh_script_progression --message="Storing installation settings..." --weight=1
 
-ynh_app_setting_set --app=$app --key=domain --value=$domain
-ynh_app_setting_set --app=$app --key=path --value=$path_url
-ynh_app_setting_set --app=$app --key=admin --value=$admin
-ynh_app_setting_set --app=$app --key=admin_password --value=$admin_password
-ynh_app_setting_set --app=$app --key=is_public --value=$is_public
-ynh_app_setting_set --app=$app --key=language --value=$language
-ynh_app_setting_set --app=$app --key=wiki_name --value=$wiki_name
-ynh_app_setting_set --app=$app --key=ldap_user --value=$ldap_user
-ynh_app_setting_set --app=$app --key=ldap_password --value=$ldap_password
+ynh_app_setting_set --app="$app" --key=domain --value="$domain"
+ynh_app_setting_set --app="$app" --key=path --value="$path_url"
+ynh_app_setting_set --app="$app" --key=admin --value="$admin"
+ynh_app_setting_set --app="$app" --key=admin_password --value="$admin_password"
+ynh_app_setting_set --app="$app" --key=is_public --value="$is_public"
+ynh_app_setting_set --app="$app" --key=language --value="$language"
+ynh_app_setting_set --app="$app" --key=wiki_name --value="$wiki_name"
+ynh_app_setting_set --app="$app" --key=ldap_user --value="$ldap_user"
+ynh_app_setting_set --app="$app" --key=ldap_password --value="$ldap_password"
 
 #=================================================
 # STANDARD MODIFICATIONS
@@ -71,26 +71,26 @@ ynh_app_setting_set --app=$app --key=ldap_password --value=$ldap_password
 #=================================================
 ynh_script_progression --message="Installing dependencies..." --weight=15
 
-ynh_install_app_dependencies $pkg_dependencies
+ynh_install_app_dependencies "${pkg_dependencies[@]}"
 
 #=================================================
 # CREATE A MYSQL DATABASE
 #=================================================
 ynh_script_progression --message="Creating a MySQL database..." --weight=1
 
-db_name=$(ynh_sanitize_dbid --db_name=$app)
+db_name=$(ynh_sanitize_dbid --db_name="$app")
 db_user=$db_name
-ynh_app_setting_set --app=$app --key=db_name --value=$db_name
-ynh_app_setting_set --app=$app --key=db_user --value=$db_user
-ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name
-# creates the variable db_pwd
+ynh_app_setting_set --app="$app" --key=db_name --value="$db_name"
+ynh_app_setting_set --app="$app" --key=db_user --value="$db_user"
+ynh_mysql_setup_db --db_user="$db_user" --db_name="$db_name"
+test -n "${db_pwd:?}" # Check the variable is correctly set by ynh_mysql_setup_db
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 ynh_script_progression --message="Setting up source files..." --weight=4
 
-ynh_app_setting_set --app=$app --key=final_path --value=$final_path
+ynh_app_setting_set --app="$app" --key=final_path --value="$final_path"
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source --dest_dir="$final_path"
 ynh_setup_source --dest_dir="$final_path/extensions/" --source_id="ldap_authentication2"
@@ -116,7 +116,7 @@ ynh_add_nginx_config
 ynh_script_progression --message="Configuring system user..." --weight=2
 
 # Create a system user
-ynh_system_user_create --username=$app
+ynh_system_user_create --username="$app"
 
 #=================================================
 # PHP-FPM CONFIGURATION
@@ -133,7 +133,9 @@ ynh_add_fpm_config
 #=================================================
 ynh_script_progression --message="Creating dedicated LDAP user..." --weight=1
 
-yunohost user create $ldap_user --firstname "MediaWikiLdap" --lastname "MediaWikiLdap" --mail ${ldap_user}@$domain --password $ldap_password -q 0
+yunohost user create "$ldap_user" \
+  --firstname "MediaWikiLdap" --lastname "MediaWikiLdap" \
+  --mail "${ldap_user}@$domain" --password "$ldap_password" -q 0
 
 #=================================================
 # RUN INSTALLATION OF MEDIAWIKI
@@ -145,26 +147,26 @@ else
   scriptpath=$path_url
 fi
 
-php $final_path/maintenance/install.php --conf $final_path \
+php "$final_path/maintenance/install.php" --conf "$final_path" \
   --server "https://$domain" \
   --scriptpath "$scriptpath" \
-  --dbuser $db_name \
-  --dbpass $db_pwd \
-  --dbname $db_name \
+  --dbuser "$db_name" \
+  --dbpass "$db_pwd" \
+  --dbname "$db_name" \
   --dbprefix "mdk_" \
-  --lang $language \
-  --pass $admin_password \
+  --lang "$language" \
+  --pass "$admin_password" \
   "$wiki_name" "$admin"
 
 #=================================================
 # REPLACE CONFIGURATION SETTINGS
 #=================================================
-cp ../conf/LocalSettings.php $final_path/LocalSettings.php
+cp ../conf/LocalSettings.php "$final_path/LocalSettings.php"
 
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__WIKI_NAME__" --replace_string="$wiki_name"
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__ADMIN__"     --replace_string="$admin"
 
-if [ $path_url = "/" ]; then
+if [ "$path_url" = "/" ]; then
     # MediaWiki expects a "" for the root URL which is typically assumed to be
     # "/" by other application packages. Therefore, we assume end-users will do
     # this as well and make sure to ensure an "" in all cases where "/" is
@@ -181,15 +183,15 @@ ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string=
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__LANGUAGE__"  --replace_string="$language"
 
 secret=$(ynh_string_random 64)
-ynh_app_setting_set $app secret $secret
+ynh_app_setting_set "$app" secret "$secret"
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__SECRET__"    --replace_string="$secret"
 
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__LDAP_USER__" --replace_string="$ldap_user"
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__LDAP_PASSWORD__" --replace_string="$ldap_password"
 
-php $final_path/maintenance/update.php
+php "$final_path/maintenance/update.php"
 
-chown -R $app:$app $final_path
+chown -R "$app:$app" "$final_path"
 
 #=================================================
 # SETUP SSOWAT
@@ -197,7 +199,7 @@ chown -R $app:$app $final_path
 ynh_script_progression --message="Configuring SSOwat..." --weight=1
 
 # Make app public if necessary
-if [ $is_public -eq 1 ]; then
+if [ "$is_public" -eq 1 ]; then
   ynh_permission_update --permission "main" --add "visitors"
 fi
 
diff --git a/scripts/remove b/scripts/remove
index a371e50..45d6067 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -16,12 +16,12 @@ ynh_script_progression --message="Loading installation settings..." --weight=1
 
 app=$YNH_APP_INSTANCE_NAME
 
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-port=$(ynh_app_setting_get --app=$app --key=port)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+domain=$(ynh_app_setting_get --app="$app" --key=domain)
+port=$(ynh_app_setting_get --app="$app" --key=port)
+db_name=$(ynh_app_setting_get --app="$app" --key=db_name)
 db_user=$db_name
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-ldap_user=$(ynh_app_setting_get --app=$app --key=ldap_user)
+final_path=$(ynh_app_setting_get --app="$app" --key=final_path)
+ldap_user=$(ynh_app_setting_get --app="$app" --key=ldap_user)
 
 #=================================================
 # STANDARD REMOVE
@@ -31,7 +31,7 @@ ldap_user=$(ynh_app_setting_get --app=$app --key=ldap_user)
 ynh_script_progression --message="Removing the MySQL database..." --weight=4
 
 # Remove a database if it exists, along with the associated user
-ynh_mysql_remove_db --db_user=$db_user --db_name=$db_name
+ynh_mysql_remove_db --db_user"=$db_user" --db_name="$db_name"
 
 #=================================================
 # REMOVE DEPENDENCIES
@@ -72,7 +72,7 @@ ynh_remove_fpm_config
 #=================================================
 ynh_script_progression --message="Removing LDAP user..." --weight=1
 
-yunohost user delete $ldap_user --purge
+yunohost user delete "$ldap_user" --purge
 
 #=================================================
 # GENERIC FINALIZATION
@@ -82,7 +82,7 @@ yunohost user delete $ldap_user --purge
 ynh_script_progression --message="Removing the dedicated system user..." --weight=1
 
 # Delete a system user
-ynh_system_user_delete --username=$app
+ynh_system_user_delete --username="$app"
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/restore b/scripts/restore
index 292b3cc..527781c 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -24,24 +24,24 @@ ynh_script_progression --message="Loading installation settings..." --weight=1
 
 app=$YNH_APP_INSTANCE_NAME
 
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-path_url=$(ynh_app_setting_get --app=$app --key=path)
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+domain=$(ynh_app_setting_get --app="$app" --key=domain)
+path_url=$(ynh_app_setting_get --app="$app" --key=path)
+final_path=$(ynh_app_setting_get --app="$app" --key=final_path)
+db_name=$(ynh_app_setting_get --app="$app" --key=db_name)
 db_user=$db_name
-ldap_user=$(ynh_app_setting_get --app=$app --key=ldap_user)
-ldap_password=$(ynh_app_setting_get --app=$app --key=ldap_password)
-phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
+ldap_user=$(ynh_app_setting_get --app="$app" --key=ldap_user)
+ldap_password=$(ynh_app_setting_get --app="$app" --key=ldap_password)
+phpversion=$(ynh_app_setting_get --app="$app" --key=phpversion)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
 #=================================================
 ynh_script_progression --message="Validating restoration parameters..." --weight=1
 
-ynh_webpath_available --domain=$domain --path_url=$path_url \
+ynh_webpath_available --domain="$domain" --path_url="$path_url" \
     || ynh_die --message="Path not available: ${domain}${path_url}"
-test ! -d $final_path \
-    || ynh_die --message="There is already a directory: $final_path "
+test ! -d "$final_path" \
+    || ynh_die --message="There is already a directory: $final_path"
 
 #=================================================
 # STANDARD RESTORATION STEPS
@@ -64,14 +64,14 @@ ynh_restore_file --origin_path="$final_path"
 ynh_script_progression --message="Recreating the dedicated system user..." --weight=2
 
 # Create the dedicated user (if not existing)
-ynh_system_user_create --username=$app
+ynh_system_user_create --username="$app"
 
 #=================================================
 # RESTORE USER RIGHTS
 #=================================================
 
 # Restore permissions on app files
-chown -R $app:$app $final_path
+chown -R "$app:$app" "$final_path"
 
 #=================================================
 # RESTORE THE PHP-FPM CONFIGURATION
@@ -87,23 +87,25 @@ ynh_restore_file --origin_path="/etc/php/$phpversion/fpm/pool.d/$app.conf"
 ynh_script_progression --message="Reinstalling dependencies..." --weight=10
 
 # Define and install dependencies
-ynh_install_app_dependencies $pkg_dependencies
+ynh_install_app_dependencies "${pkg_dependencies[@]}"
 
 #=================================================
 # RESTORE THE MYSQL DATABASE
 #=================================================
 ynh_script_progression --message="Restoring the MySQL database..." --weight=5
 
-db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
-ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name --db_pwd=$db_pwd
-ynh_mysql_connect_as --user=$db_user --password=$db_pwd --database=$db_name < ./db.sql
+db_pwd=$(ynh_app_setting_get --app="$app" --key=mysqlpwd)
+ynh_mysql_setup_db --db_user="$db_user" --db_name="$db_name" --db_pwd="$db_pwd"
+ynh_mysql_connect_as --user="$db_user" --password="$db_pwd" --database="$db_name" < ./db.sql
 
 #=================================================
 # RESTORE THE LDAP USER
 #=================================================
 ynh_script_progression --message="Restoring LDAP dedicated user..." --weight=1
 
-yunohost user create $ldap_user --firstname "MediaWikiLdap" --lastname "MediaWikiLdap" --mail ${ldap_user}@$domain --password $ldap_password -q 0
+yunohost user create "$ldap_user" \
+    --firstname "MediaWikiLdap" --lastname "MediaWikiLdap" \
+    --mail "${ldap_user}@$domain" --password "$ldap_password" -q 0
 
 #=================================================
 # GENERIC FINALIZATION
@@ -112,7 +114,7 @@ yunohost user create $ldap_user --firstname "MediaWikiLdap" --lastname "MediaWik
 #=================================================
 ynh_script_progression --message="Reloading nginx web server and php-fpm..." --weight=1
 
-ynh_systemd_action --service_name=php$phpversion-fpm --action=reload
+ynh_systemd_action --service_name="php$phpversion-fpm" --action=reload
 ynh_systemd_action --service_name=nginx --action=reload
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 7003f21..f4406e7 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -16,23 +16,23 @@ ynh_script_progression --message="Loading installation settings..." --weight=1
 
 app=$YNH_APP_INSTANCE_NAME
 
-domain=$(ynh_app_setting_get --app=$app --key=domain)
-path_url=$(ynh_app_setting_get --app=$app --key=path)
-admin=$(ynh_app_setting_get --app=$app --key=admin)
-is_public=$(ynh_app_setting_get --app=$app --key=is_public)
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-language=$(ynh_app_setting_get --app=$app --key=language)
-wiki_name=$(ynh_app_setting_get --app=$app --key=wiki_name)
-db_name=$(ynh_app_setting_get --app=$app --key=db_name)
-db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
-ldap_user=$(ynh_app_setting_get --app=$app --key=ldap_user)
-ldap_password=$(ynh_app_setting_get --app=$app --key=ldap_password)
+domain=$(ynh_app_setting_get --app="$app" --key=domain)
+path_url=$(ynh_app_setting_get --app="$app" --key=path)
+admin=$(ynh_app_setting_get --app="$app" --key=admin)
+is_public=$(ynh_app_setting_get --app="$app" --key=is_public)
+final_path=$(ynh_app_setting_get --app="$app" --key=final_path)
+language=$(ynh_app_setting_get --app="$app" --key=language)
+wiki_name=$(ynh_app_setting_get --app="$app" --key=wiki_name)
+db_name=$(ynh_app_setting_get --app="$app" --key=db_name)
+db_pwd=$(ynh_app_setting_get --app="$app" --key=mysqlpwd)
+ldap_user=$(ynh_app_setting_get --app="$app" --key=ldap_user)
+ldap_password=$(ynh_app_setting_get --app="$app" --key=ldap_password)
 
 # Note(decentral1se): avoid using this on upgrade for the versions
 # of the application that upgrade and have not stored this in their
 # settings (when it was not available to them). Later on, when we have
 # moved a few versions on, we can re-enable this
-# wiki_name=$(ynh_app_setting_get --app=$app --key=wiki_name)
+# wiki_name=$(ynh_app_setting_get --app="$app" --key=wiki_name)
 
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY
@@ -41,23 +41,23 @@ ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
 
 # Fix is_public as a boolean value
 if [ "$is_public" = "Yes" ]; then
-    ynh_app_setting_set --app=$app --key=is_public --value=1
+    ynh_app_setting_set --app="$app" --key=is_public --value=1
     is_public=1
 elif [ "$is_public" = "No" ]; then
-    ynh_app_setting_set --app=$app --key=is_public --value=0
+    ynh_app_setting_set --app="$app" --key=is_public --value=0
     is_public=0
 fi
 
 # If db_name doesn't exist, create it
 if [ -z "$db_name" ]; then
-    db_name=$(ynh_sanitize_dbid --db_name=$app)
-    ynh_app_setting_set --app=$app --key=db_name --value=$db_name
+    db_name=$(ynh_sanitize_dbid --db_name="$app")
+    ynh_app_setting_set --app="$app" --key=db_name --value="$db_name"
 fi
 
 # If final_path doesn't exist, create it
 if [ -z "$final_path" ]; then
-    final_path=/var/www/$app
-    ynh_app_setting_set --app=$app --key=final_path --value=$final_path
+    final_path="/var/www/$app"
+    ynh_app_setting_set --app="$app" --key=final_path --value="$final_path"
 fi
 
 #=================================================
@@ -79,7 +79,7 @@ ynh_abort_if_errors
 #=================================================
 
 # Normalize the URL path syntax
-path_url=$(ynh_normalize_url_path --path_url=$path_url)
+path_url=$(ynh_normalize_url_path --path_url="$path_url")
 
 #=================================================
 # STANDARD UPGRADE STEPS
@@ -111,7 +111,7 @@ ynh_add_nginx_config
 #=================================================
 ynh_script_progression --message="Upgrading dependencies..." --weight=3
 
-ynh_install_app_dependencies $pkg_dependencies
+ynh_install_app_dependencies "${pkg_dependencies[@]}"
 
 #=================================================
 # CREATE DEDICATED USER
@@ -119,7 +119,7 @@ ynh_install_app_dependencies $pkg_dependencies
 ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
 
 # Create a dedicated user (if not existing)
-ynh_system_user_create --username=$app
+ynh_system_user_create --username="$app"
 
 #=================================================
 # PHP-FPM CONFIGURATION
@@ -137,11 +137,13 @@ ynh_add_fpm_config
 ynh_script_progression --message="Creating dedicated LDAP user if necessary..." --weight=1
 
 if [[ -z "$ldap_user" ]]; then
-  ldap_user="${app}_ldap"
-  ldap_password=$(ynh_string_random --length=8)
-  ynh_app_setting_set --app="$app" --key=ldap_user --value="$ldap_user"
-  ynh_app_setting_set --app="$app" --key=ldap_password --value="$ldap_password"
-  yunohost user create $ldap_user --firstname "MediaWikiLdap" --lastname "MediaWikiLdap" --mail ${ldap_user}@$domain --password $ldap_password -q 0
+    ldap_user="${app}_ldap"
+    ldap_password=$(ynh_string_random --length=8)
+    ynh_app_setting_set --app="$app" --key=ldap_user --value="$ldap_user"
+    ynh_app_setting_set --app="$app" --key=ldap_password --value="$ldap_password"
+    yunohost user create "$ldap_user" \
+        --firstname "MediaWikiLdap" --lastname "MediaWikiLdap" \
+        --mail "${ldap_user}@$domain" --password "$ldap_password" -q 0
 fi
 
 #=================================================
@@ -154,13 +156,13 @@ ynh_backup_if_checksum_is_different --file="$final_path/CONFIG_FILE"
 #=================================================
 ynh_script_progression --message="Upgrading application files..." --weight=4
 
-rm $final_path/LocalSettings.php
-cp ../conf/LocalSettings.php $final_path/LocalSettings.php
+rm "$final_path/LocalSettings.php"
+cp ../conf/LocalSettings.php "$final_path/LocalSettings.php"
 
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__WIKI_NAME__" --replace_string="$wiki_name"
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__ADMIN__"     --replace_string="$admin"
 
-if [ $path_url = "/" ]; then
+if [ "$path_url" = "/" ]; then
     # MediaWiki expects a "" for the root URL which is typically assumed to be
     # "/" by other application packages. Therefore, we assume end-users will do
     # this as well and make sure to ensure an "" in all cases where "/" is
@@ -177,20 +179,20 @@ ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string=
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__LANGUAGE__"  --replace_string="$language"
 
 secret=$(ynh_string_random 64)
-ynh_app_setting_set $app secret $secret
+ynh_app_setting_set "$app" secret "$secret"
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__SECRET__"    --replace_string="$secret"
 
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__LDAP_USER__" --replace_string="$ldap_user"
 ynh_replace_string --target_file="$final_path/LocalSettings.php" --match_string="__LDAP_PASSWORD__" --replace_string="$ldap_password"
 
-php $final_path/maintenance/update.php
+php "$final_path/maintenance/update.php"
 
 #=================================================
 # SECURE FILES AND DIRECTORIES
 #=================================================
 
 # Set permissions on app files
-chown -R $app:$app $final_path
+chown -R "$app:$app" "$final_path"
 
 #=================================================
 # SETUP SSOWAT