Common commands for Ubuntu permission management

Common commands for Ubuntu permission management

Common commands for Ubuntu permission management

1. chmod

Method 1

Chomd [{ugoa} {+-=}{ rwx}] [file or directory]

U indicates the user to which the file belongs.
G indicates the user group to which the file belongs.
O represents a visitor
A Represents all users

+-= Add permissions, reduce permissions, or grant permissions respectively

Grant all users the write permission to the t2.tmp file:

Method 2:

Chmod [mode = 421] [file or folder]

4 indicates read permission
2 indicates write permission
1 indicates the execution permission

For example, if the user of a file has all permissions, the group has read and execution permissions, and others have execution permissions, you can set the permission as follows:

Rwx:

2. chown [target user] [file or folder]

Change the owner of a file or directory

Change the t2.tmp file owner to lenve

3. chgrp [user group] [files or directories]

Change the group of a file or directory

4. umask [-S] specifies the default permission mask when a file is created. -S indicates the permission mask in rwx format.