Setup my blog using Hexo

• Check the system 64 or 22 bit:
  getconf LONG_BIT

• Check space usage:
  df -h

• Check processes:
  ps ux or ps -ef or lsof -n -i

• Kill a process:
  kill -9 PID

• Check Ubuntu version
  $cat /etc/lsb-release

• Check folder size
  du -sh /PATH_TO_FOLDER

• Display information about the contents of ELF files
  readelf -h libname.a

• To create a soft link
  ln -s /full/path/of/original/file /full/path/of/soft/link/file

• To remove all the .svn files from the previous version control system
  find . -name .svn -exec rm -rf {} \;

• Find all .py files and rename them to .html files
  find . -name "*.py" -exec rename 's/.py/.html/' '{}' \;

• Find all files and folders without metadata and filter by date Oct, then remove them
  ls -tl | grep -v metadata | awk '/Oct/ {print $NF}' | xargs rm -rf

• CTRL + ALT + F7 for switching to gui, CTRL + ALT + F1 to switch to CLI.

• Put down/up interface "eth0" sudo ifconfig eth0 down/up

• Keep runing after exit, refer http://en.wikipedia.org/wiki/Nohup nohup sth &

• Get a list of packages installed locally, refer http://askubuntu.com/questions/17823/how-to-list-all-installed-packages dpkg --get-selections | grep -v deinstall

• Analysis tcp transport via "eth0" interface on port 1883, refer https://danielmiessler.com/study/tcpdump/ sudo tcpdump -i eth0 port 1883 -XX

• Sort the files by size du -sh * | sort -h

• Remove old files, filtered by year ll | grep 2015 | awk '{print $9}' | xargs rm

• Apache HTTP server benchmarking load test ab -n 10000 -c 100 http://localhost/

• bitbake get DISTRO_VERSION and return version number bitbake -e core-image-x | grep ^DISTRO_VERSION= | awk -F= '{print $2}' | sed 's/\"//g'

• Search keyword grep -rin keyword

• Show full path in the Finder window
  defaults write com.apple.finder _FXShowPosixPathInTitle TRUE killall Finder

• Get the external monitor
  export EX_MONITOR=$(xrandr | grep " connected " | grep -v "primary" | awk '{print $1}')