git revert commits

short answer:
git revert  xxx ( xxx is the commit hash)

long answer:
http://www.kernel.org/pub/software/scm/git/docs/howto/revert-branch-rebase.html

Linux upstart

http://www.linuxplanet.com/linuxplanet/tutorials/7033/1

http://www.ibm.com/developerworks/linux/library/l-lpic1-v3-101-3/

update BIOS and nvram

http://www.pixelbeat.org/docs/bios/

Awk guide

An Awk Primer

http://www.vectorsite.net/tsawk.html