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A free derivative of BSD Unix, 1992BSD, was released in 1992 and led to the NetBSD and FreeBSD projects.
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chgrp(1) [freebsd man page]

CHGRP(1)						    BSD General Commands Manual 						  CHGRP(1)

NAME
chgrp -- change group SYNOPSIS
chgrp [-fhvx] [-R [-H | -L | -P]] group file ... DESCRIPTION
The chgrp utility sets the group ID of the file named by each file operand to the group ID specified by the group operand. The following options are available: -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. This is the default. -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 does not query about strange modes (unless the user does not have proper permissions). -h If the file is a symbolic link, the group ID of the link itself is changed rather than the file that is pointed to. -v Cause chgrp to be verbose, showing files as the group is modified. If the -v flag is specified more than once, chgrp will print the filename, followed by the old and new numeric group ID. -x File system mount points are not traversed. 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 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. FILES
/etc/group group ID file EXIT STATUS
The chgrp utility exits 0 on success, and >0 if an error occurs. COMPATIBILITY
In previous versions of this system, symbolic links did not have groups. The -v and -x options are non-standard and their use in scripts is not recommended. SEE ALSO
chown(2), fts(3), group(5), passwd(5), symlink(7), chown(8) STANDARDS
The chgrp utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BSD
February 21, 2010 BSD

Check Out this Related Man Page

CHOWN(8)						    BSD System Manager's Manual 						  CHOWN(8)

NAME
chown -- change file owner and group SYNOPSIS
chown [-fhvx] [-R [-H | -L | -P]] owner[:group] file ... chown [-fhvx] [-R [-H | -L | -P]] :group file ... DESCRIPTION
The chown utility changes the user ID and/or the group ID of the specified files. Symbolic links named by arguments are silently left unchanged unless -h is used. The options are as follows: -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. This is the default. -R Change the user ID and/or the group ID of the specified directory trees (recursively, including their contents) and files. Beware of unintentionally matching the ``..'' hard link to the parent directory when using wildcards like ``.*''. -f Do not report any failure to change file owner or group, nor modify the exit status to reflect such failures. -h If the file is a symbolic link, change the user ID and/or the group ID of the link itself. -v Cause chown to be verbose, showing files as the owner is modified. If the -v flag is specified more than once, chown will print the filename, followed by the old and new numeric user/group ID. -x File system mount points are not traversed. 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 owner and group operands are both optional, however, one must be specified. If the group operand is specified, it must be preceded by a colon (``:'') character. The owner may be either a numeric user ID or a user name. If a user name is also a numeric user ID, the operand is used as a user name. The group may be either a numeric group ID or a group name. If a group name is also a numeric group ID, the operand is used as a group name. The ownership of a file may only be altered by a super-user for obvious security reasons. EXIT STATUS
The chown utility exits 0 on success, and >0 if an error occurs. COMPATIBILITY
Previous versions of the chown utility used the dot (``.'') character to distinguish the group name. This has been changed to be a colon (``:'') character so that user and group names may contain the dot character. On previous versions of this system, symbolic links did not have owners. The -v and -x options are non-standard and their use in scripts is not recommended. SEE ALSO
chgrp(1), find(1), chown(2), fts(3), symlink(7) STANDARDS
The chown utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compliant. HISTORY
A chown utility appeared in Version 1 AT&T UNIX. BSD
February 21, 2010 BSD

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