File modes are described by a nine characters string that follows the same scheme as the ls shell command:

Position	Character	Meaning
1	-	The file owner cannot read it.
	r	The file owner can read it.
2	-	The file owner cannot write it.
	w	The file owner can write it.
3	-	The file owner cannot execute it.
	x	The file owner can execute it.
	S	The file owner cannot execute it and the 'setuid' bit is set.
	s	The file owner can execute it and the 'setuid' bit is set.
4	-	The file group cannot read it.
	r	The file owner can read it.
5	-	The file group cannot write it.
	w	The file group can write it.
6	-	The file group cannot execute it.
	x	The file group can execute it.
	S	The file group cannot execute it and the 'setgid' bit is set.
	s	The file group can execute it and the 'setgid' bit is set.
7	-	Other users cannot read the file.
	r	Other users can read the file.
8	-	Other users cannot write the file.
	w	Other users can write the file.
9	-	Other users cannot execute the file.
	x	Other users can execute the file.
	T	Other users cannot execute the file and the 'sticky' bit is set.
	t	Other users can execute the file and the 'sticky' bit is set.