CHGRP(1) NetBSD General Commands Manual CHGRP(1)
chgrp -- change 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 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. -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. 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 exten- sions to IEEE Std 1003.2 (``POSIX.2''). NetBSD 7.1.2 October 22, 2012 NetBSD 7.1.2
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