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A directory with the sticky bit set means that only the file owner and the superuser can remove files from that directory. Other users are denied the right to remove files, irrespective of directory permissions. Only the superuser can place the sticky bit on a directory.
A sticky directory contains a ``t'' at the end of the permissions field, as in this example:
drwxrwxrwt 2 bin bin 1088 Mar 18 21:10 tmp