acl_extended_file - Linux

Overview

acl_extended_file is a Linux command used to manage extended access control lists (ACLs) associated with a particular file. ACLs provide granular control over who can access a file and what operations they can perform. This command allows for the manipulation of both user and group-based ACLs.

Syntax

acl_extended_file [-n] [-q] [-d] [-c] [-s] [-t] [-w] [-v] [-h] [--help] [--version] <file>

Options/Flags

• -n, –no-access
  Hide access ACL entries.
• -q, –quiet
  Suppress all warnings.
• -d, –default
  Show the default ACL entries.
• -c, –canonical
  Show the canonical ACL entries.
• -s, –stats
  Show statistics about the ACLs.
• -t, –text
  Show the ACLs in text format.
• -w, –write
  Write the ACLs back to the file.
• -v, –verbose
  Enable verbose mode.
• -h, –help
  Display help information.
• –version
  Display version information.

Examples

Display the ACLs for a file:

acl_extended_file myfile

Add an entry to the ACL:

acl_extended_file -w myfile -a user:alice:rwx

Remove an entry from the ACL:

acl_extended_file -w myfile -d user:bob

Common Issues

• Permission denied: Ensure the user has sufficient permissions to modify the ACLs.
• Invalid ACL format: Verify that the ACLs are specified in the correct format.
• File not found: Check that the specified file exists.

Integration

acl_extended_file can be used in conjunction with other commands, such as chmod and chown, to manage file permissions. For example:

chmod -R 744 mydir
acl_extended_file -R -w mydir -a group:mygroup:r

This command chain sets the permissions on the directory mydir and its subdirectories to 744 and adds read permissions for the group mygroup to all files within mydir.

Related Commands

• chmod: Change file permissions.
• chown: Change file ownership.
• getfacl: Get file ACLs.
• setfacl: Set file ACLs.