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BSD 2.11 - man page for sticky (bsd section 8)

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STICKY(8)										STICKY(8)

NAME
       sticky - persistent text and append-only directories

DESCRIPTION
       The  sticky  bit (file mode bit 01000, see chmod(2)) is used to indicate special treatment
       for certain executable files and directories.

STICKY TEXT EXECUTABLE FILES
       While the `sticky bit' is set on a sharable executable file, the text of  that  file  will
       not  be removed from the system swap area.  Thus the file does not have to be fetched from
       the file system upon each execution.  Shareable text segments are  normally  placed  in	a
       least-frequently-used cache after use, and thus the `sticky bit' has little effect on com-
       monly-used text images.

       Sharable executable files are made by the -n and -z options of ld(1).

       Only the super-user can set the sticky bit on a sharable executable file.

STICKY DIRECTORIES
       A directory whose `sticky bit' is set becomes an append-only  directory,  or,  more  accu-
       rately,	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 /tmp  which  must  be
       publicly  writable  but should deny users the license to arbitrarily delete or rename each
       others' files.

       Any user may create a sticky directory.	See chmod(1) for  details  about  modifying  file
       modes.

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.

       Neither open(2) nor mkdir(2) will create a file with the sticky bit set.

4th Berkeley Distribution		   May 26, 1986 				STICKY(8)
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