chgrp(1) - NetBSD Manual Pages

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CHGRP(1)                NetBSD General Commands Manual                CHGRP(1)


NAME

     chgrp -- change group


SYNOPSIS

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


DESCRIPTION

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

     Options:

     -H      If the -R option is specified, symbolic links on the command line
             are followed.  (Symbolic links encountered in the tree traversal
             are not followed.)

     -L      If the -R option is specified, all symbolic links are followed.

     -P      If the -R option is specified, no symbolic links are followed.

     -R      Change the group ID for the file hierarchies rooted in the files
             instead of just the files themselves.

     -d      Do not attempt to update a file's group, nor update the file's
             set-user-id or set-group-id bits if they are already set to the
             desired values.

     -f      The force option ignores errors, except for usage errors and
             doesn't query about strange modes (unless the user does not have
             proper permissions).

     -h      If file is a symbolic link, the group of the link is changed.

     -v      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 sym-
     bolic 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.


FILES

     /etc/group  Group ID file


EXIT STATUS

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


SEE ALSO

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


STANDARDS

     The chgrp utility is expected to be POSIX 1003.2 compatible.

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

NetBSD 10.99                     May 19, 2023                     NetBSD 10.99