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STICKY(8)                 BSD System Manager's Manual                STICKY(8)

     sticky -- sticky text and append-only directories

     A special file mode, called the sticky bit (mode S_ISTXT), is used to
     indicate special treatment for directories.  It is ignored for regular
     files.  See chmod(2) or the file <sys/stat.h> for an explanation of file

     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 /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.

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

     A sticky command appeared in Version 32V AT&T UNIX.

BSD                              June 5, 1993                              BSD