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Do a search-and-replace in a file after making a backup

get a fresh commandlinefu-item each day as motd
Commandline-fu often has little tricks that I always forget. By adding this to the root-cron (sudo crontab -e) I lean a new trick every day.

check open ports without netstat or lsof

Fast portscanner via Parallel

Search gpg keys from commandline

Cleanup debian/ubuntu package configurations
Sometimes, simpler is better.

Processes by CPU usage

Archive a directory with datestamp on filename
A useful bash function: gztardir() { if [ $# -ne 1 ] ; then echo "incorrect arguments: should be gztardir " else tar zcvf "${1%/}-$(date +%Y%m%d-%H%M).tar.gz" "$1" fi }

camelcase to underscore
For mac users !

Find the package that installed a command


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