1. You said it is not production box, not much critical, so take it easy.. grab a cup of black coffee and take a long deep breathe. And dont forget to thank god, it was mv command, not rm.

2. Talk to your boss, dont feel embarrassing. Shit happens.. specially in sys admin job. He will understand it.

3. No backup, no root privilege and working on remote machine = You can not do anything in this case.

4. Guys, he is saying- he can not issue any system-level commands, so forget about rebooting / installing with LIVE CD . Unless there is some back-up/restore script (I strongly believe it should be there), he can not write back to /lib/ as a normal user.

5. Back up what you have copied to your /local directory. Someone with su access will restore back to /lib/.

6. 'mv does not mean you moved it. It means it got renamed.' - Please dont advise unless you know what you are saying..

7. You learn the most when you make mistakes (as long as it is not so disastrous that you will be screwed up.. )