total 12 drwxr-xr-x 22 root root 4096 May 21 2011 linux-source-2.6.38-2-amd64-mm82 drwxr-xr-x 24 root root 4096 Jul 26 22:13 linux-source-3.0.0-mbp82-lina drwxr-sr-x 24 root root 4096 Dec 1 17:35 linux-source-3.1-lina Hi, How can I change the -sr- to xr and what does the s here stands for? Thanks,