NetBSD/share/man/man8/sticky.8

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.\" $NetBSD: sticky.8,v 1.5 1998/05/26 04:05:54 ross Exp $
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.\" @(#)sticky.8 8.1 (Berkeley) 6/5/93
.\"
.Dd May 25, 1998
.Dt STICKY 8
.\".Os BSD 4
.Sh NAME
.Nm sticky
.Nd `sticky' append-only directories
.Sh DESCRIPTION
A special file mode, called the
.Em sticky bit
(mode S_ISVTX),
is used to indicate special treatment for directories.
See
.Xr chmod 2
or
the file
.Pa /usr/include/sys/stat.h
.Sh STICKY FILES
The use of mode S_ISVTX is reserved and can be set only by
the super-user.
.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.
.\"It would be nice to have the HISTORY section, but it's wrong...I believe
.\"the sticky bit had meaning even on the PDP-11...which predates 32V.
.\".Sh HISTORY
.\"A
.\".Nm
.\"command appeared in
.\".At 32v .