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+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    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
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)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
+An executable shareable file whose sticky bit is set
+will not be immediately discarded from swap space after execution.
+The kernel will hoard the text segment of the file for future
+reuse and avoid having to reload the program.
+Shareable text segments are normally placed
+in a least-frequently-used cache after use,
+and thus the `sticky bit' has little effect on commonly-used text images.
+.Pp
+Sharable executable files are created with the
+.Fl n
+and
+.Fl z
+options of
+the loader
+.Xr ld 1 .
+.Pp
+Only the super-user can set the sticky bit
+on a sharable executable file.
+.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
+Since the text areas of sticky text executables are stashed in the swap area,
+abuse of the feature can cause a system to run out of swap.
+.Pp
+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.