Lock a files in Linux

lewkh · 02-26-2008, 04:25 AM

Hi Folks

Could you tell me how do I lock a file in Linux? Which means, chmod or rm of root user also operation not permitted.

Anybody know how to do that?

Thanks

Simon Bridge · 02-26-2008, 04:35 AM

Can root create a file which even root cannot modify? This, in different forms, is a question that has puzzles theists and people of such ilk through the ages.

See this, last panel.

Presumably chmod 0000 filename will do it. But I am reluctant to try... I like being able to modify files. Why would anyone even want to try this?

lewkh · 02-26-2008, 10:10 AM

No, it is not chmod change to 0000 because you are not permitted even is root user. I wonder know because my files disappear unconsciously. But my superior can "lock" the files even root user cannot chmod or rm.

Thus I wondering how he do that to "lock" file? I am thinking that inode. Could any body give the info?

Thanks

Emerson · 02-26-2008, 10:29 AM

Extended attributes allow to do this by setting immutable flag. See man attr.

Edit: man chattr for EXT filesystem.

unSpawn · 02-27-2008, 06:45 AM

@Lewk: since your FUP question wasn't about Linux Security, and LQ likes you to create a new thread for questions that have no bearing on your OP, I've pruned it. It now lives at http://www.linuxquestions.org/questi...-inode-624176/.