Control serial port on Windows 7

use hyperterminal, which needs to be downloaded or copied from a XP machine.

http://digitizor.com/2009/08/29/install-winxp-hyperterminal-client-on-windows-vista-or-windows-7-free/

then usage guide:
http://ozitronics.com/download/hyperterminal.pdf

Apache for Windows 7 64bit

Apache for Windows 7 64bit:

http://www.anindya.com/apache-http-server-2-2-x64-and-x86-msi-installers/

32bit version from the official website does not work on my Win7 64 machine.

The newbie's guide to hacking the Linux kernel

http://tuxradar.com/content/newbies-guide-hacking-linux-kernel

git book:

http://book.git-scm.com/index.html

HOWTO: Create and submit your first Linux kernel patch using GIT
http://linux.koolsolutions.com/2011/02/26/howto-create-and-submit-your-first-linux-kernel-patch/

Git - SVN crash Course:

http://git.or.cz/course/svn.html

git merge and conflict:

http://genomewiki.ucsc.edu/index.php/Resolving_merge_conflicts_in_Git

http://blog.wuwon.id.au/2010/09/painless-merge-conflict-resolution-in.html

http://gitready.com/advanced/2009/02/25/keep-either-file-in-merge-conflicts.html

list only directories on Linux

cmd:
ls -d /*

ref:
http://embraceubuntu.com/2005/10/19/list-only-the-directories/
http://www.unix-manuals.com/forum/viewtopic.php?t=71

Redhat enterprise Linux / CentOS installing kernel source code

http://www.cyberciti.biz/faq/rhel5-installing-kernel-source-code/

How To Extract an RPM Package Without Installing It (rpm extract command)
http://www.cyberciti.biz/tips/how-to-extract-an-rpm-package-without-installing-it.html

grep more than one word

http://rajaseelan.com/2009/07/04/how-to-search-grep-for-more-than-one-word-at-a-time/

Ignore binary files

grep -I (capitol i)

cpu frenquency on Linux

Question: my desktop has a AMD 2.2GHz CPU, but the /proc/cpuinfo shows that the frequency is only 1G Hz. Why?

Answer: the cpu has been set to a low freqency to save the power.

Ref: http://www.pantz.org/software/cpufreq/usingcpufreqonlinux.html