linux-Common Commands (2) Rights Management commands

Rights Management Command: chmod

Command name: chmod

Command English original:change the permisssions modE of a file

Command location:/bin/chmod

Execute Permissions: 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

Numeric Representation of permissions

R----4

W----2

X----1

rwx rw- r--

7 6 4

Example:

$ chmod g+w testfile

Give the file testfile the group Write permission

$ chmod-r 777 TestDir

Modify directory TestDir and its directory files for all users with full permissions

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Rights Management Command : Chown

Command name: CHOWM

Command English original meaning:change file ownership

Command location:/bin/chown

Execute Permissions: All Users

Function Description: Change the owner of a file or directory

Syntax: chown [user] [file or directory]

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Rights Management Command : CHGRP

Command name: CHOWM

Command English Original: chAnge file grouP ownership

Command location:/bin/chowm

Execute Permissions: All Users

Function Description: Change the owning group of a file or directory

Syntax: chown [user] [file or directory]

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Rights Management Command : umask

Command name: umask

Command English Original: the user file-creation Mask

Command path: Shell built-in commands

Execute Permissions: All Users

Function Description: Display, set default permissions for files

Syntax: umask [-S]

-S A rwx form shows the new file default permissions

linux-Common Commands (2) Rights Management commands