acl_clear_perms - Linux
Overview
acl_clear_perms is a powerful command-line tool designed to remove or restrict specified permissions for files, directories, and symbolic links in Linux systems. It provides granular control over access rights, allowing users to fine-tune permissions for various entities such as users, groups, and others.
Syntax
acl_clear_perms [-v] [-R] [-dacl [type]] [-acl [type]] <object1> [object2] ...
Parameters:
- -v: Verbose mode, provides detailed output during execution.
- -R: Recursive mode, applies changes to all subdirectories within the specified object.
- -dacl [type] or -acl [type] (default: user): Specifies the Access Control List (ACL) type to modify. Supported types include "user", "group", "mask", or "other".
Options/Flags
-dacl [type]: Removes or restricts permissions specified by the ACL of the given type.
-acl [type]: Adds or restricts permissions specified by the ACL of the given type.
Examples
Simple Usage:
acl_clear_perms -v myfile.txt
This command removes all permissions from the file myfile.txt
and displays verbose output.
Recursive Mode:
acl_clear_perms -R /home/user
This command removes all permissions from the directory /home/user
and all its subdirectories.
Specifying ACL Type:
acl_clear_perms -acl group my_image.png
This command removes all group permissions from the file my_image.png
.
Common Issues
- Ensure that you have sufficient privileges (root or administrative access) to modify permissions.
- If ACLs are not properly configured, they can override default permissions, so always double-check your settings.
Integration
Integrating with find:
find . -type f -exec acl_clear_perms {} \;
This command removes all file permissions from all files in the current directory.
Related Commands
- setfacl: Sets or modifies file permissions using ACLs.
- getfacl: Retrieves ACLs for files.
- chmod: Modifies file permissions using traditional octal or symbolic modes.