[OT] How to fix a stupid chmod mistake without rebooting
matthew.flaschen at gatech.edu
Sat Mar 28 03:45:30 UTC 2009
For reasons I'm not entirely clear, / was world-writable on a machine
(not the whole computer, just /). So I blithely ran:
sudo chmod go-rwx /
(note, no -R, I'm not *that* dumb).
to correct it (can't be giving out permissions willy nilly!).
Then, to admire my handiwork I did:
zsh: command not found: ls
That's odd... (repeat ls several times in hope results will change).
Start typing /bi hit tab to complete instinctually, zsh auto-complete
prints errors like: (eval):3: permission denied: /dev/null
Finally realize what is happening (almost)
to go to root to fix it.
zsh: command not found: su
So by this point I am rather unhappy, and wondering if I'm going to
break out a rescue CD. But of course, I had root enabled on this
machine, so I finally remembered the virtual terminal (already running
login) could save me:
Login as root. Enter:
sudo chmod a+rx /
Save the day.
Lessons (pick any two)
1. Keep root enabled
2. sudo will not stop you from making stupid decisions.
3. Don't run sudo chmod a-rwx /
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