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Chmod command in Linux

with examples

Linux chmod command is used to change the access permissions of files and directories.

Chmod Command

Changes the access permissions of a file or directory. On Unix systems, permissions apply to:
  • read (r)
  • write (w)
  • execute (x)

chmod syntax

    chmod [options] [permissions] [file name] 

chmod options

  • -c, –changes : as verbose, but only reported when a change has occurred
  • -f, –silent, –quiet : disable most error messages
  • -v, –verbose : print information about each file being processed
  • –no-preserve-root : do not treat the “/” directory in a special way (default)
  • –preserve-root : deny recussive action on “/”
  • –reference=GM_FILE : use permissions of GM_FILE instead of AUTHORIZATION value
  • -R, –recursive : changes also to directories and files in subdirectories
  • –version : output version information and exit

Numerical Shorthand chmod

Digit Laws Letter
0 No rights
1 Exercise –x
2 Record -In-
3 Recording and execution -wx
4 Reading r–
5 Read and Execute r-x
6 Read and write rw-
7 Read, write and execute rwx
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