mirror of https://github.com/mkerrisk/man-pages
213 lines
7.1 KiB
Groff
213 lines
7.1 KiB
Groff
|
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
|
||
|
.TH "CHGRP" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
|
||
|
.\" chgrp
|
||
|
.SH NAME
|
||
|
chgrp \- change the file group ownership
|
||
|
.SH SYNOPSIS
|
||
|
.LP
|
||
|
\fBchgrp\fP \fB[\fP\fB-hR\fP\fB]\fP \fIgroup file\fP \fB...
|
||
|
.br
|
||
|
.sp
|
||
|
chgrp -R\fP \fB[\fP\fB-H | -L | -P\fP \fB]\fP \fIgroup file\fP \fB...
|
||
|
.br
|
||
|
\fP
|
||
|
.SH DESCRIPTION
|
||
|
.LP
|
||
|
The \fIchgrp\fP utility shall set the group ID of the file named by
|
||
|
each \fIfile\fP operand to the group ID specified by the
|
||
|
\fIgroup\fP operand.
|
||
|
.LP
|
||
|
For each \fIfile\fP operand, or, if the \fB-R\fP option is used, each
|
||
|
file encountered while walking the directory trees
|
||
|
specified by the \fIfile\fP operands, the \fIchgrp\fP utility shall
|
||
|
perform actions equivalent to the \fIchown\fP() function defined in
|
||
|
the System Interfaces volume of IEEE\ Std\ 1003.1-2001,
|
||
|
called with the following arguments:
|
||
|
.IP " *" 3
|
||
|
The \fIfile\fP operand shall be used as the \fIpath\fP argument.
|
||
|
.LP
|
||
|
.IP " *" 3
|
||
|
The user ID of the file shall be used as the \fIowner\fP argument.
|
||
|
.LP
|
||
|
.IP " *" 3
|
||
|
The specified group ID shall be used as the \fIgroup\fP argument.
|
||
|
.LP
|
||
|
.LP
|
||
|
Unless \fIchgrp\fP 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.
|
||
|
.SH OPTIONS
|
||
|
.LP
|
||
|
The \fIchgrp\fP utility shall conform to the Base Definitions volume
|
||
|
of IEEE\ Std\ 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
|
||
|
.LP
|
||
|
The following options shall be supported by the implementation:
|
||
|
.TP 7
|
||
|
\fB-h\fP
|
||
|
If the system supports group IDs for symbolic links, for each \fIfile\fP
|
||
|
operand that names a file of type symbolic link,
|
||
|
\fIchgrp\fP 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 \fIfile\fP
|
||
|
operand that names a file of type symbolic link,
|
||
|
\fIchgrp\fP shall do nothing more with the current file and shall
|
||
|
go on to any remaining files.
|
||
|
.TP 7
|
||
|
\fB-H\fP
|
||
|
If the \fB-R\fP option is specified and a symbolic link referencing
|
||
|
a file of type directory is specified on the command line,
|
||
|
\fIchgrp\fP shall change the group of the directory referenced by
|
||
|
the symbolic link and all files in the file hierarchy below
|
||
|
it.
|
||
|
.TP 7
|
||
|
\fB-L\fP
|
||
|
If the \fB-R\fP option is specified and a symbolic link referencing
|
||
|
a file of type directory is specified on the command line
|
||
|
or encountered during the traversal of a file hierarchy, \fIchgrp\fP
|
||
|
shall change the group of the directory referenced by the
|
||
|
symbolic link and all files in the file hierarchy below it.
|
||
|
.TP 7
|
||
|
\fB-P\fP
|
||
|
If the \fB-R\fP option is specified and a symbolic link is specified
|
||
|
on the command line or encountered during the traversal
|
||
|
of a file hierarchy, \fIchgrp\fP shall change the group ID of the
|
||
|
symbolic link if the system supports this operation. The
|
||
|
\fIchgrp\fP utility shall not follow the symbolic link to any other
|
||
|
part of the file hierarchy.
|
||
|
.TP 7
|
||
|
\fB-R\fP
|
||
|
Recursively change file group IDs. For each \fIfile\fP operand that
|
||
|
names a directory, \fIchgrp\fP shall change the group of
|
||
|
the directory and all files in the file hierarchy below it. Unless
|
||
|
a \fB-H\fP, \fB-L\fP, or \fB-P\fP option is specified, it is
|
||
|
unspecified which of these options will be used as the default.
|
||
|
.sp
|
||
|
.LP
|
||
|
Specifying more than one of the mutually-exclusive options \fB-H\fP,
|
||
|
\fB-L\fP, and \fB-P\fP shall not be considered an error.
|
||
|
The last option specified shall determine the behavior of the utility.
|
||
|
.SH OPERANDS
|
||
|
.LP
|
||
|
The following operands shall be supported:
|
||
|
.TP 7
|
||
|
\fIgroup\fP
|
||
|
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 \fIfile\fP operands. If a numeric \fIgroup\fP 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.
|
||
|
.TP 7
|
||
|
\fIfile\fP
|
||
|
A pathname of a file whose group ID is to be modified.
|
||
|
.sp
|
||
|
.SH STDIN
|
||
|
.LP
|
||
|
Not used.
|
||
|
.SH INPUT FILES
|
||
|
.LP
|
||
|
None.
|
||
|
.SH ENVIRONMENT VARIABLES
|
||
|
.LP
|
||
|
The following environment variables shall affect the execution of
|
||
|
\fIchgrp\fP:
|
||
|
.TP 7
|
||
|
\fILANG\fP
|
||
|
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, Internationalization Variables
|
||
|
for
|
||
|
the precedence of internationalization variables used to determine
|
||
|
the values of locale categories.)
|
||
|
.TP 7
|
||
|
\fILC_ALL\fP
|
||
|
If set to a non-empty string value, override the values of all the
|
||
|
other internationalization variables.
|
||
|
.TP 7
|
||
|
\fILC_CTYPE\fP
|
||
|
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 arguments).
|
||
|
.TP 7
|
||
|
\fILC_MESSAGES\fP
|
||
|
Determine the locale that should be used to affect the format and
|
||
|
contents of diagnostic messages written to standard
|
||
|
error.
|
||
|
.TP 7
|
||
|
\fINLSPATH\fP
|
||
|
Determine the location of message catalogs for the processing of \fILC_MESSAGES
|
||
|
\&.\fP
|
||
|
.sp
|
||
|
.SH ASYNCHRONOUS EVENTS
|
||
|
.LP
|
||
|
Default.
|
||
|
.SH STDOUT
|
||
|
.LP
|
||
|
Not used.
|
||
|
.SH STDERR
|
||
|
.LP
|
||
|
The standard error shall be used only for diagnostic messages.
|
||
|
.SH OUTPUT FILES
|
||
|
.LP
|
||
|
None.
|
||
|
.SH EXTENDED DESCRIPTION
|
||
|
.LP
|
||
|
None.
|
||
|
.SH EXIT STATUS
|
||
|
.LP
|
||
|
The following exit values shall be returned:
|
||
|
.TP 7
|
||
|
\ 0
|
||
|
The utility executed successfully and all requested changes were made.
|
||
|
.TP 7
|
||
|
>0
|
||
|
An error occurred.
|
||
|
.sp
|
||
|
.SH CONSEQUENCES OF ERRORS
|
||
|
.LP
|
||
|
Default.
|
||
|
.LP
|
||
|
\fIThe following sections are informative.\fP
|
||
|
.SH APPLICATION USAGE
|
||
|
.LP
|
||
|
Only the owner of a file or the user with appropriate privileges may
|
||
|
change the owner or group of a file.
|
||
|
.LP
|
||
|
Some implementations restrict the use of \fIchgrp\fP to a user with
|
||
|
appropriate privileges when the \fIgroup\fP specified is
|
||
|
not the effective group ID or one of the supplementary group IDs of
|
||
|
the calling process.
|
||
|
.SH EXAMPLES
|
||
|
.LP
|
||
|
None.
|
||
|
.SH RATIONALE
|
||
|
.LP
|
||
|
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 unworkable 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.
|
||
|
.LP
|
||
|
The functionality of \fIchgrp\fP is described substantially through
|
||
|
references to \fIchown\fP(). In this way, there is no duplication
|
||
|
of effort required for describing the
|
||
|
interactions of permissions, multiple groups, and so on.
|
||
|
.SH FUTURE DIRECTIONS
|
||
|
.LP
|
||
|
None.
|
||
|
.SH SEE ALSO
|
||
|
.LP
|
||
|
\fIchmod\fP() , \fIchown\fP() , the System Interfaces volume of
|
||
|
IEEE\ Std\ 1003.1-2001, \fIchown\fP()
|
||
|
.SH 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 original Standard can be obtained online at
|
||
|
http://www.opengroup.org/unix/online.html .
|