[Linux Learning Notes] Linux Common commands-rights management commands

Linux Rights Management commands
1. Change file or directory permissions: chmod

Command name: chmod command English Original: Change the permissions mode of a file command where the path:/bin/chmod Execute permissions: All user syntax: chmod [{ugo} {+-=} {rwx}] [file or directory] [mode=421] [File or directory] Function description: Change file or directory permissions

Representative character	Permissions	The meaning of the file	The meaning of the directory
R	Read permissions	Can view the contents of a file	You can list content in a directory
W	Write permissions	Can modify the contents of a file	You can create and modify files in the directory
X	Execute permissions	Can execute file	Access to Directory

File:

Read Permissions R operation : Cat, More, head, tail;  Write permission W operation: Echo, VI; Execute permissions x: command, script

Directory:

Read Permissions R operation: LS (List contents in the directory);  Write permission W operation: touch, mkdir, RM; Execute permissions x: CD

2. Change the file owner: Chown

Command name: Chown Command English Original: Change file ownership command path:/bin/chown Execute permissions: All user syntax: chown [user] [file or directory] function description: Changes the owner of the files or directories

3. Change the owning group of the file or directory: Chgrp

Command name: CHGRP Command English Original: Change file group Ownership command path:/BIN/CHGRP Execute permissions: All user syntax: chgrp [user] [file or directory] function description: Changes the group of files or directories belonging to

4. Default permissions for display, device files: umask

Command name: Umask command in English: command path:/bin/umask Execute permissions: All user syntax: Umask [-S]-s to display new file or directory default permissions in rwx form umask [permission mask value] Modify default Permissions function Description: Display, set file The default permissions

Example:

[Email protected] test]# umask-su=rwx,g=rx,o=rx[[email protected] test]# umask0022

Description: the umask command returns 0022, the first bit 0 represents the special permission bit, the latter three bits 022 represents the user permission bit, is the permission mask value , and its permission should be 777 minus its value.

Note: Linux permissions rule: Files created by default cannot grant executable x permissions

[Linux Learning Notes] Linux Common commands-rights management commands