chown — Change file Owner and Group.
`chown’ changes the user and/or group ownership of each given file to the specified user and/or group.
$ chown usr1 file1 — Make usr1 as the owner of the file1. No change in the group.
$ chown usr1 f1 f2 f3 — Make usr1 as owner for f1, f2 and f3.
$ chown usr1.grp1 file1 — Change owner as usr1 and group ad grp1 of the file1.
$ chown usr1:grp1 file1 — Same as above. But `:’ in place of the `.’ separator.
$ chown 500:400 file1 — Set a user, Whos user id is 500, as the owner and a group, which id is 400, as the group.
$ chown usr1. file1 — No group is specified after DOT. So usr1’s login group taken as group.
$ chown .grp1 file1 — Only group will change
$ chown -R usr1:grp1 dir1 — Recursively change ownership of Dir and their contents.
$ chown -c usr1 f1 f2 f3 — Show verbose output only when a change is made.
$ chown -v usr1 f1 f2 f3 — Show verbose output for every file processed.
$ chown -f usr1 f1 f2 f3 — Force/Silent/Quiet. Do not print error messages.
$ chown –reference=that this — Set the ‘that’ file’s owner and group to ‘this’ file.
$ chown –from=usr1 usr2 * — Change a file’s ownership only if it’s owner is usr1
- Seperators ‘.’ and ‘:’ are interechangeable
- No embedded whitespace is allowed between user and group
- Instead of user/group name, User ID and Group ID can be used.
$ echo $UID — Show User ID.
$ echo $GROUP — Show Group ID.
Read : man chown