reale und effektive UID / GID
caladan:~$ id
uid=1000(letho) gid=1000(letho) groups=1000(letho),25(floppy),29(audio),100(users)
caladan:~$ ls -l /bin
-rwsr-xr-x 1 root root 14768 Mar 25 04:55 ping
-rwsr-xr-x 1 root root 13328 Mar 25 04:55 ping6
-rwxr-xr-x 1 root root 12468 Oct 30 1998 ps
-rwxr-xr-x 1 root root 4996 Nov 19 12:55 pwd
lrwxrwxrwx 1 root root 4 Apr 10 22:06 rbash -> bash
-rwxr-xr-x 1 root root 10124 Jul 3 1998 rm
-rwxr-xr-x 1 root root 4916 Jul 3 1998 rmdir
-rwxr-xr-x 1 root root 7864 Aug 16 1998 run-parts
drwx------ 2 root root 1024 Apr 10 22:02 secure-su
-rwxr-sr-x 1 root shadow 10928 Mar 29 1998 vlock