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Burn CD/DVD from an iso, eject disc when finished.
cdrecord -scanbus will tell you the (x,y,z) value of your cdr (for example, mine is 3,0,0)

Get My Public IP Address

List alive hosts in specific subnet
Works on any machine with nmap installed. Previous version does not work on machines without "seq". Also works on subnets of any size.

strips the first field of each line where the delimiter is the first ascii character

continuously check size of files or directories

Timer with sound alarm
I'd prefer this one, you have to install espeak to get this running

OSX command to take badly formatted xml from the clipboard, cleans it up and puts it back into the clipboard.
This command can be used with xclip or xsel for use on a linux box.

Measure, explain and minimize a computer's electrical power consumption
Run this command as root to get enough stats. It works on AMD and Intel machines, including desktops. If ran on a laptop it'll give you suggestions on extending your battery life. You'll need to install PowerTOP if you don't have, via 'apt-get install powertop', etc. To grep the output use: sudo powertop -d | grep ... The many command suggestions PowerTOP gives you alone will increase your command-line fu!

parrallel execution of a command on remote hosts by ssh or rsh or ...
parrallel execution of a command on remote host by ssh or rsh or ... very useful for cluster management (software update)

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }


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