08-10-2001
The sticky bit is for the folowing reason:
"With the sticky bit set, only the owner of a file or directory (or the super-user) may change that file's or directory's mode. Only the super-user may set the sticky bit on a non-directory file. If you are not super-user, chmod will mask the sticky-bit but will not return an error. In order to turn on a file's set-group-ID bit, your own group ID must correspond to the file's and group execution must be set."
HTT
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LEARN ABOUT MOJAVE
sticky
STICKY(7) BSD Miscellaneous Information Manual STICKY(7)
NAME
sticky -- sticky text and append-only directories
DESCRIPTION
A special file mode, called the sticky bit (mode S_ISVTX), 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 modes.
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 /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.
HISTORY
A sticky command appeared in Version 32V AT&T UNIX.
BUGS
Neither open(2) nor mkdir(2) will create a file with the sticky bit set.
BSD
June 5, 1993 BSD