The sticky bit is a permission bit that protects the files within a directory. If the directory has the sticky bit set, a file can be deleted only by the owner of the file, the owner of the directory, or by root. This special permission prevents a user from deleting other users' files from public directories such as /tmp:
drwxrwxrwt 7 root sys 400 Sep 3 13:37 tmp |
Be sure to set the sticky bit manually when you set up a public directory on a TMPFS file system.