Sometime on Jul 30, Sameer Sahasrabuddhe assembled some asciibets to say:
drwxrwxrwt 7 root root 1024 Jul 31 10:00 /tmp
The manpages mention that the "t" has something to do with making the file stay on the swap device. What is all this about?
That's for files. For directories, it means that only the owner can delte or overwrite files in the directory. Notice that it has world writable perms, which in normal conditions would allow anyone to delete anyone else's files.
Philip