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CHGRP(1) General Commands Manual CHGRP(1)

chgrpchange group

chgrp [-R [-H | -L | -P]] [-fhv] group file ...

chgrp [-R [-H | -L | -P]] [-fhv] --reference=rfile file ...

The chgrp utility sets the group ID of the file named by each file operand to the group ID specified by the group operand, or to the group of the given rfile, specified by the --reference argument.

Options:

If the -R option is specified, symbolic links on the command line are followed. (Symbolic links encountered in the tree traversal are not followed.)
If the -R option is specified, all symbolic links are followed.
If the -R option is specified, no symbolic links are followed.
Change the group ID for the file hierarchies rooted in the files instead of just the files themselves.
The force option ignores errors, except for usage errors and doesn't query about strange modes (unless the user does not have proper permissions).
If file is a symbolic link, the group of the link is changed.
Cause chgrp to be verbose, showing files as they are processed.

If -h is not given, unless the -H or -L option is set, chgrp on a symbolic link always succeeds and has no effect. The -H, -L and -P options are ignored unless the -R option is specified. In addition, these options override each other and the command's actions are determined by the last one specified. The default is as if the -P option had been specified.

The group operand can be either a group name from the group database, or a numeric group ID. Since it is valid to have a group name that is numeric (and doesn't have the numeric ID that matches its name) the name lookup is always done first. Preceding the ID with a ``#'' character will force it to be taken as a number.

The user invoking chgrp must belong to the specified group and be the owner of the file, or be the super-user.

Unless invoked by the super-user, chgrp clears the set-user-id and set-group-id bits on a file to prevent accidental or mischievous creation of set-user-id or set-group-id programs.

The chgrp utility exits 0 on success, and >0 if an error occurs.

/etc/group
Group ID file

chown(2), lchown(2), fts(3), group(5), passwd(5), symlink(7), chown(8)

The chgrp utility is expected to be POSIX 1003.2 compatible.

The -v option and the use of ``#'' to force a numeric group ID are extensions to IEEE Std 1003.2 (“POSIX.2”).

October 22, 2012 NetBSD-7.0.1