Commands Help : chmod

  •  chmod - change file access permissions

[SYNOPSIS] chmod OPTION PERMISSIONS FILE/DIRECTORY

option
-Rchange files and directories recursively
# chmod -R 700 /home

 OPTION PERMISSIONS

Here the digits 7, 5, and 4 each individually represent the permissions for the user, group, and others, in that order. Each digit is a combination of the numbers 4, 2, 1, and 0:

      • 4 stands for "read",
      • 2 stands for "write",
      • 1 stands for "execute", and
      • 0 stands for "no permission."

So 7 is the combination of permissions 4+2+1 (read, write, and execute), 5 is 4+0+1 (read, no write, and execute), and 4 is 4+0+0 (read, no write, and no execute).

 

-c, --changes

Like --verbose, but gives verbose output only when a change is actually made.

-f, --silent, --quiet

Quiet mode; suppress most error messages.

-v, --verbose

Verbose mode; output a diagnostic message for every file processed.

--no-preserve-root

Do not treat '/' (the root directory) in any special way, which is the default setting.

--preserve-root

Do not operate recursively on '/'.

--reference=RFILE

Set permissions to match those of file RFILE, ignoring any specified MODE.

-R, --recursive

Change files and directories recursively.

--help

Display a help message and exit.

--version

Output version information and exit.

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