176 lines
4.5 KiB
Groff
176 lines
4.5 KiB
Groff
.\" $OpenBSD: chown.1,v 1.21 2017/05/28 08:03:36 awolk Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993, 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)chown.8 8.3 (Berkeley) 3/31/94
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.\"
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.Dd $Mdocdate: May 28 2017 $
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.Dt CHOWN 1
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.Os
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.Sh NAME
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.Nm chown
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.Nd change file owner and group
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.Sh SYNOPSIS
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.Nm chown
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.Op Fl h
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.Oo
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.Fl R
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.Op Fl H | L | P
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.Oc
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.Ar owner Ns Op : Ns Ar group
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.Ar
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.Nm chown
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.Op Fl h
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.Oo
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.Fl R
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.Op Fl H | L | P
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.Oc
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.Pf : Ar group
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.Ar
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.Sh DESCRIPTION
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.Nm
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sets the user ID and/or the group ID of the specified files.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl H
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If the
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.Fl R
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option is specified, symbolic links on the command line are followed.
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Symbolic links encountered in the tree traversal are not followed.
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.It Fl h
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Treat symbolic links like other files: modify links instead of
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following them.
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The
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.Fl h
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and
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.Fl R
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options are mutually exclusive.
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.It Fl L
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If the
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.Fl R
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option is specified, all symbolic links are followed.
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.It Fl P
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If the
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.Fl R
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option is specified, no symbolic links are followed.
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.It Fl R
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Recurse.
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Where
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.Ar file
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is a directory,
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change the user ID and/or the group ID of the directory
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and all the files and directories in the file hierarchy below it.
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.El
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.Pp
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The
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.Fl H ,
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.Fl L ,
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and
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.Fl P
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options are ignored unless the
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.Fl R
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option is specified;
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if none of them are given,
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the default is to not follow symbolic links.
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In addition, these options override each other and the
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command's actions are determined by the last one specified.
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.Pp
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The
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.Ar owner
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and
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.Ar group
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operands are both optional; however, one must be specified.
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If the
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.Ar group
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operand is specified, it must be preceded by a colon
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.Pq Sq \&:
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character.
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.Pp
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The
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.Ar owner
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may be either a numeric user ID or a user name.
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If a user name is also a numeric user ID, the operand is used as a
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user name.
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The
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.Ar group
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may be either a numeric group ID or a group name.
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If a group name is also a numeric group ID, the operand is used as a
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group name.
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.Pp
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By default,
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.Nm
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clears the set-user-ID and set-group-ID bits on the file
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to prevent accidental or mischievous creation of
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set-user-ID and set-group-ID programs.
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This behaviour can be overridden by setting the
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.Xr sysctl 8
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variable
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.Va fs.posix.setuid
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to zero.
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.Pp
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Only the superuser is permitted to change the owner of a file.
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.Sh EXIT STATUS
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.Ex -std chown
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.Sh SEE ALSO
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.Xr chgrp 1 ,
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.Xr find 1 ,
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.Xr chown 2 ,
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.Xr fts 3 ,
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.Xr symlink 7
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.Sh STANDARDS
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The
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.Nm
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utility is compliant with the
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.St -p1003.1-2008
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specification.
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.Pp
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The ability to specify
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.Ar group
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without
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.Ar owner
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is an extension to that specification.
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.Pp
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Some
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.Pf non- Bx
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systems may allow the (non-privileged) owner of a file to change
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its ownership.
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.Pp
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Previous versions of the
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.Nm
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utility used the dot
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.Pq Sq \&.
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character to distinguish the group name.
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This was changed when the utility was first standardised in
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.St -p1003.2-92
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to be a colon
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.Pq Sq \&:
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character to allow user and group names to contain the dot
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character, though the dot separator still remains supported
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due to widely required backwards compatibility.
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