4는 setuid, 2는 setgid, 1은 sticky bit

[jjangkbg@test1 ~]$ ls -al 111
-rwxrwxrwt 1 jjangkbg jjangkbg 0 Feb  2 10:25 111
[jjangkbg@test1 ~]$ chmod 2777 111
[jjangkbg@test1 ~]$ ls -al 111
-rwxrwsrwx 1 jjangkbg jjangkbg 0 Feb  2 10:25 111
[jjangkbg@test1 ~]$ chmod 4777 111
[jjangkbg@test1 ~]$ ls -al 111
-rwsrwxrwx 1 jjangkbg jjangkbg 0 Feb  2 10:25 111
[jjangkbg@test1 ~]$ chmod 1666 111
[jjangkbg@test1 ~]$ ls -al 111
-rw-rw-rwT 1 jjangkbg jjangkbg 0 Feb  2 10:25 111


[jjangkbg@test1 ~]$ chmod 1667 111
[jjangkbg@test1 ~]$ ls -al 111
-rw-rw-rwt 1 jjangkbg jjangkbg 0 Feb  2 10:25 111

T -> 실행권한 없을 때
t -> 실행권한 있을때