acl_add_perm - Linux


acl_add_perm is a command-line utility designed to modify the Access Control Lists (ACLs) associated with files and directories. It allows administrators to grant or deny specific permissions to users or groups, controlling their access to these resources.


acl_add_perm [options] <file|directory> <user|group> <permission>


  • -R, –recursive: Recursively process all files and directories within the specified path.
  • -s, –silent: Suppress output, except for errors.
  • -v, –verbose: Display detailed information about the ACL changes made.


  • Grant read permission to user ‘alice’ on the file ‘myfile.txt’:
acl_add_perm myfile.txt alice read
  • Grant write permission to group ‘developers’ on the directory ‘/projects’:
acl_add_perm -R /projects developers write
  • Display verbose information while adding execute permission to user ‘bob’ on the file ‘’:
acl_add_perm -v bob execute

Common Issues

  • Permission denied: Ensure you have sufficient privileges to modify ACLs.
  • Invalid permission: Check if the requested permission is valid for the user or group.
  • Non-existent user or group: Verify that the specified user or group exists in the system.


  • find: Use acl_add_perm with find to apply ACL changes to multiple files and directories based on specific criteria.
  • bash: Incorporate acl_add_perm into shell scripts to automate ACL management tasks.

Related Commands

  • acl_get_perm: Retrieve ACL permissions for a file or directory.
  • acl_set_perm: Set specific ACL permissions, replacing existing permissions.
  • chmod: Modify file and directory permissions using octal or symbolic notation.