diff --git a/package_linter.py b/package_linter.py
index 0bd6277..a76e4a1 100755
--- a/package_linter.py
+++ b/package_linter.py
@@ -30,6 +30,8 @@ def header(app_path):
           "YUNOHOST APP PACKAGE LINTER\n", c.END,
     "App packaging documentation: https://yunohost.org/#/packaging_apps\n",
     "App package example: https://github.com/YunoHost/example_ynh\n",
+    "Official helpers: https://yunohost.org/#/packaging_apps_helpers_en\n",
+    "Experimental helpers: https://github.com/YunoHost-Apps/Experimental_helpers\n"
     "Checking " + c.BOLD + app_path + c.END + " package\n")
 
 
@@ -253,6 +255,9 @@ def check_script(path, script_name, script_nbr):
     if script_nbr < 5:
         check_verifications_done_before_modifying_system(read_file(script_path))
         check_set_usage(script_name, read_file(script_path))
+        check_helper_usage_dependencies(script_path, script_name)
+        check_helper_usage_unix(script_path, script_name)
+        check_helper_consistency(script_path, script_name)
         #check_arg_retrieval(script.copy())
 
 
@@ -354,6 +359,52 @@ def check_arg_retrieval(script):
         print_wrong("Argument retrieval from manifest with $1 is deprecated. You may use $YNH_APP_ARG_*")
         print_wrong("For more details see: https://yunohost.org/#/packaging_apps_arguments_management_en")
 
+def check_helper_usage_dependencies(path, script_name):
+    """
+    Detect usage of ynh_package_* & apt-get *
+    and suggest herlpers ynh_install_app_dependencies and ynh_remove_app_dependencies
+    """
+    script = read_file(path)
+
+    if "ynh_package_install" in script or "apt-get install" in script:
+        print_warning("You should not use `ynh_package_install` or `apt-get install`, use `ynh_install_app_dependencies` instead")
+
+    if "ynh_package_remove" in script or "apt-get remove" in script:
+        print_warning("You should not use `ynh_package_remove` or `apt-get removeè, use `ynh_remove_app_dependencies` instead")
+
+def check_helper_usage_unix(path, script_name):
+    """
+    Detect usage of unix commands with helper equivalents:
+    - sudo    → ynh_exec_as
+    - rm      → ynh_secure_remove
+    - sed -i  → ynh_replace_string
+    """
+    script = read_file(path)
+
+    if "rm -rf" in script or "rm -Rf" in script:
+        print_wrong("[YEP-2.12] You should avoid using `rm -rf`, please use `ynh_secure_remove` instead")
+
+    if "sed -i" in script:
+        print_warning("[YEP-2.12] You should avoid using `sed -i`, please use `ynh_replace_string` instead")
+
+    if "sudo " in script:
+        print_warning("[YEP-2.12] You should not need to use `sudo`, the script is being run as root. (If you need to run a command using a specific user, use `ynh_exec_as`)")
+
+def check_helper_consistency(path, script_name):
+    """
+    check if ynh_install_app_dependencies is present in install/upgrade/restore
+    so dependencies are up to date after restoration or upgrade
+    """
+    script = read_file(path)
+
+    if script_name == "install" and "ynh_install_app_dependencies" in script:
+        for name in ["upgrade", "restore"]:
+            try:
+                script2 = read_file(os.path.dirname(path) + "/" + name)
+                if not "ynh_install_app_dependencies" in script2:
+                    print_warning("ynh_install_app_dependencies should also be in %s script" % name)
+            except FileNotFoundError:
+                pass
 
 if __name__ == '__main__':
     if len(sys.argv) != 2: