Accidentally removed var/folders  and Mac pro wouldn't boot.

I accidentally typed rm -rf * inside var/folders. Then the computer started behaving erratically. I tried to reboot but then it doesn't go beyond the grey screen.
I used the verbose option of the boot and it seems it gets stuck at the "waiting for DSMOS" step. Since I'm away from home and do not have my own DVD installer for the OS X, I used my friends' disk to see the problem with the Disk Utility tool. There seemed to be a problem and the utility repaired it. I tried rebooting the computer, but it still gets stuck at the same point.
I have checked using the Terminal option (with the DVD Installer) that the data on my hard drive is still intact. Is there a way to get my system boot.
Not an option:
1. Using firmwire.
2. Using backup/ system restore: There does not seem to be any time machine or system restore options.
3. Using the original DVD Installer for OS X as I'm out of station.
I can however buy a new DVD. Please help me boot my system. Thanks!

My ArchiveUtility (the one that unzips zipped files) was throwing an error regarding some disk permission. I searched online and found the instruction to use rm -rf * inside the var/folders. Now with some hindsight, it was the singlemost stupid thing I could have done.
A sidenote: I have logged in using the single-user mode. Is there a way to copy the var folder from this mode to the actual machine? I read there is an option of rewriting var with private/var using this mode in linux systems but not sure if there is a similar way for macs. Any thoughts? Thanks again for all the help!

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