Linux-Common commands (2) permission management commands, linux-permission management

Linux-Common commands (2) permission management commands, linux-permission management

Permission management command: chmod

Command name: chmod

Command: change the permisssions mode of a file

Command path strength:/bin/chmod

Execution permission: All Users

Function Description: Create a new directory-p recursive Creation

Syntax: chmod [{Ugoa}{+-=}{Rwx}] [File or directory]

[Mode = 421] [File or directory]

-R recursive Modification

Number of Permissions

R ---- 4

W ---- 2

X ---- 1

Rwxrw-r --

7 6 4

Example:

$ Chmod g + w testfile

Grant the write permission to the group to which the file testfile belongs.

$ Chmod-R 777 testdir

Modify the directory testdir and the files in the directory to grant all permissions to all users.

----------------------------------------------------------------------------------

Permission management commands: Chown

Command name: chowm

Command: change file ownership

Command path strength:/bin/chown

Execution permission: All Users

Function Description: Change the owner of a file or directory.

Syntax: chown [user] [file or directory]

----------------------------------------------------------------------------------

Permission management commands: Chgrp

Command name: chowm

Command: change file group ownership

Command path strength:/bin/chowm

Execution permission: All Users

Function Description: Change the group to which a file or directory belongs.

Syntax: chown [user] [file or directory]

----------------------------------------------------------------------------------

Permission management commands: Umask

Command name: umask

The user file-creation mask

Command path strength: shell built-in commands

Execution permission: All Users

Function Description: displays and sets the default permissions for files.

Syntax: umask [-S]

-S: displays the default permission for creating a new file in rwx format