What is CHMOD command?

What is CHMOD command?

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The CHMOD command is used to change file access permissions in Linux.

Syntax:

CHMOD [option] [mode] <file1, file2, ...>

Option: The following is a list of some important options that can be provided with the command:

Option	Description
-c, --changes	Provides information when a change is made.
-f, --silent, --quiet	Suppresses most error messages.
-R, --recursive	Changes files and directories recursively.
--help	Displays the help of the command.
--version	Displays version information of the command.

Mode: Mode is written in the following format:

[ugoa] [+-=] [rwxXstugo]

The combination of ugoa specifies the users for whom the file access permissions will be changed. In ugoa, u is for the user who owns the file, g is for other users in the file group, o is for other users not in the file group, and a is for all users.

The operator + adds the specified permissions to the existing permissions of each file. The - operator removes, and the = character specifies that the specified permissions are the only permissions for that file.

The combination of rwxXstugo is permission type. In rwxXstugo, r is for read, w is for write, x is for execute, X is to execute only if the file is a directory or already has execute permission for some user, s is to set user or group ID on execution, t is to save program text on swap device, u are the permissions that the user who owns the file currently has for it, g are the permissions that other users in the file group have for the file, and o are the permissions that other users not in the file group have for the file.

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