What is the statement to modify permissions in Linux?

The statement to modify permissions in Linux is "chmod [-R] permission value file or directory name"; this statement can modify the permissions of the specified file. The chmod command is a command to control the user's permissions on the file. The setting of permissions Methods can use text or numerical codes; file calling permissions can be divided into file owners, user groups and other users.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is the statement to modify permissions in Linux

Linux chmod (full English spelling: change mode) command is a command to control user permissions on files

Linux/Unix files The calling permissions are divided into three levels: file owner (Owner), user group (Group), and other users (Other Users).

Only the file owner and superuser can modify the permissions of a file or directory. You can use absolute mode (octal number mode) and symbolic mode to specify file permissions.

Usage permissions: all users

Syntax

chmod [-cfvR] [--help] [--version] mode file...

Parameter description

mode: permission setting string , the format is as follows:

[ugoa...][[ -=][rwxX]...][,...]

where:

u means The owner of the file, g represents the person who belongs to the same group as the owner of the file, o represents other people, and a represents all three.

means adding permissions, - means canceling permissions, = means setting only permissions.

r means readable, w means writable, x means executable, and X means only when the file is a subdirectory or the file has been set to be executable.

Other parameter descriptions:

-c: If the file permissions have indeed been changed, the change action will be displayed

-f: If the file permissions cannot be changed, do not Display error message

-v: Display detailed information about permission changes

-R: Make the same permission changes to all files and subdirectories in the current directory (that is, change them one by one recursively) )

--help: Display auxiliary instructions

--version: Display version

The example is as follows:

Set the file file1.txt to everyone Readable by all:

chmod ugo+r file1.txt

Set the file file1.txt to be readable by everyone:

chmod a+r file1.txt

Set the files file1.txt and file2.txt as the owner of the file, and with them People who belong to the same group can write, but others cannot write:

chmod ug+w,o-w file1.txt file2.txt

Recommended learning: Linux video tutorial

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