xnu-3789.1.32.tar.gz

[apple/xnu.git] / bsd / man / man8 / sticky.8

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-.\"    $NetBSD: sticky.8,v 1.3 1994/11/30 19:36:27 jtc Exp $
-.\"
-.\" Copyright (c) 1980, 1991, 1993
-.\"    The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"    This product includes software developed by the University of
-.\"    California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-.\"
-.\"     @(#)sticky.8   8.1 (Berkeley) 6/5/93
-.\"
-.Dd June 5, 1993
-.Dt STICKY 8
-.Os BSD 4
-.Sh NAME
-.Nm sticky
-.Nd sticky text and append-only directories
-.Sh DESCRIPTION
-A special file mode, called the
-.Em sticky bit
-(mode S_ISVTX),
-is used to indicate special treatment
-for shareable executable files and directories.
-See
-.Xr chmod 2
-or
-the file
-.Pa /usr/include/sys/stat.h
-for an explanation of file modes.
-.Sh STICKY TEXT EXECUTABLE FILES
-The sticky bit has no effect on executable files. All optimization on
-whether text images remain resident in memory is handled by the
-kernel's virtual memory system.
-.Sh STICKY DIRECTORIES
-A directory whose `sticky bit' is set
-becomes an append-only directory, or, more accurately,
-a directory in which the deletion of files is restricted.
-A file in a sticky directory may only be removed or renamed
-by a user if the user has write permission for the directory and
-the user is the owner of the file, the owner of the directory,
-or the super-user.
-This feature is usefully applied to directories such as
-.Pa /tmp
-which must be publicly writable but
-should deny users the license to arbitrarily
-delete or rename each others' files.
-.Pp
-Any user may create a sticky directory.
-See
-.Xr chmod 1
-for details about modifying file modes.
-.Sh BUGS
-Neither
-.Xr open 2
-nor
-.Xr mkdir 2
-will create a file with the sticky bit set.
-.Sh HISTORY
-A
-.Nm
-command appeared in Version 32V AT&T UNIX.