CHGRP(1) BSD Reference Manual CHGRP(1)
chgrp - change group
chgrp [-R [-H | -L | -P]] [-f] group files ...
The chgrp utility sets the group ID of the file named by each file
operand to the group ID specified by the group operand.
-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
Symbolic links don't have groups, so 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 addi-
tion, these options override each other and the command's actions are de-
termined by the last one specified.
The group operand can be either a group name from the group database, or
a numeric group ID. If a group name is also a numeric group ID, the
operand is used as a group name.
The user invoking chgrp must belong to the specified group and be the
owner of the file, or be the super-user.
The chgrp utility exits 0 on success, and >0 if an error occurs.
Previous versions of the chgrp utility changed the group of symbolic
links specified on the command line. In this system, symbolic links do
not have groups.
/etc/group Group ID file
chown(2), group(5), passwd(5), fts(3), symlink(7), chown(8)
The chgrp utility is expected to be POSIX 1003.2 compatible.
4.2 Berkeley Distribution March 31, 1994 1