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Linux 2.6 - man page for chgrp (linux section 1posix)

CHGRP(P)			    POSIX Programmer's Manual				 CHGRP(P)

NAME
       chgrp - change the file group ownership

SYNOPSIS
       chgrp [-hR] group file ...

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

DESCRIPTION
       The  chgrp  utility  shall  set the group ID of the file named by each file operand to the
       group ID specified by the group operand.

       For each file operand, or, if the -R option is used, each file encountered  while  walking
       the  directory  trees  specified  by  the  file	operands, the chgrp utility shall perform
       actions equivalent to the chown() function defined in  the  System  Interfaces  volume  of
       IEEE Std 1003.1-2001, called with the following arguments:

	* The file operand shall be used as the path argument.

	* The user ID of the file shall be used as the owner argument.

	* The specified group ID shall be used as the group argument.

       Unless chgrp is invoked by a process with appropriate privileges, the set-user-ID and set-
       group-ID bits of a regular file shall be cleared upon successful completion; the set-user-
       ID and set-group-ID bits of other file types may be cleared.

OPTIONS
       The  chgrp  utility  shall conform to the Base Definitions volume of IEEE Std 1003.1-2001,
       Section 12.2, Utility Syntax Guidelines.

       The following options shall be supported by the implementation:

       -h     If the system supports group IDs for symbolic links, for	each  file  operand  that
	      names  a file of type symbolic link, chgrp shall attempt to set the group ID of the
	      symbolic link instead of the file referenced by the symbolic link.  If  the  system
	      does  not  support group IDs for symbolic links, for each file operand that names a
	      file of type symbolic link, chgrp shall do nothing more with the current	file  and
	      shall go on to any remaining files.

       -H     If the -R option is specified and a symbolic link referencing a file of type direc-
	      tory is specified on the command line, chgrp shall change the group of  the  direc-
	      tory referenced by the symbolic link and all files in the file hierarchy below it.

       -L     If the -R option is specified and a symbolic link referencing a file of type direc-
	      tory is specified on the command line or encountered during the traversal of a file
	      hierarchy, chgrp shall change the group of the directory referenced by the symbolic
	      link and all files in the file hierarchy below it.

       -P     If the -R option is specified and a symbolic link is specified on the command  line
	      or  encountered  during  the  traversal of a file hierarchy, chgrp shall change the
	      group ID of the symbolic link if the system  supports  this  operation.  The  chgrp
	      utility shall not follow the symbolic link to any other part of the file hierarchy.

       -R     Recursively  change  file  group IDs. For each file operand that names a directory,
	      chgrp shall change the group of the directory and all files in the  file	hierarchy
	      below  it.  Unless  a -H, -L, or -P option is specified, it is unspecified which of
	      these options will be used as the default.

       Specifying more than one of the mutually-exclusive options -H, -L, and  -P  shall  not  be
       considered  an error.  The last option specified shall determine the behavior of the util-
       ity.

OPERANDS
       The following operands shall be supported:

       group  A group name from the group database or a numeric  group	ID.  Either  specifies	a
	      group  ID  to be given to each file named by one of the file operands. If a numeric
	      group operand exists in the group database as a group name,  the	group  ID  number
	      associated with that group name is used as the group ID.

       file   A pathname of a file whose group ID is to be modified.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of chgrp:

       LANG   Provide  a  default  value for the internationalization variables that are unset or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization Variables for the precedence of internationalization variables used
	      to determine the values of locale categories.)

       LC_ALL If set to a non-empty string value, override the values of all the  other  interna-
	      tionalization variables.

       LC_CTYPE
	      Determine  the  locale for the interpretation of sequences of bytes of text data as
	      characters (for example, single-byte as opposed to multi-byte characters	in  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages written to standard error.

       NLSPATH
	      Determine the location of message catalogs for the processing of LC_MESSAGES .

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The following exit values shall be returned:

	0     The utility executed successfully and all requested changes were made.

       >0     An error occurred.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       Only the owner of a file or the user with appropriate privileges may change the	owner  or
       group of a file.

       Some  implementations restrict the use of chgrp to a user with appropriate privileges when
       the group specified is not the effective group ID or one of the supplementary group IDs of
       the calling process.

EXAMPLES
       None.

RATIONALE
       The  System  V and BSD versions use different exit status codes. Some implementations used
       the exit status as a count of the number of errors that occurred; this practice is unwork-
       able  since it can overflow the range of valid exit status values. The standard developers
       chose to mask these by specifying only 0 and >0 as exit values.

       The functionality of chgrp is described substantially through references  to  chown().  In
       this  way,  there  is no duplication of effort required for describing the interactions of
       permissions, multiple groups, and so on.

FUTURE DIRECTIONS
       None.

SEE ALSO
       chmod() , chown() , the System Interfaces volume of IEEE Std 1003.1-2001, chown()

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 CHGRP(P)


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