commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Note: you'll want to set up pub-key ssh auth. Gives you a quick means of changing volume/tracks/etc for rhythmbox on a remote machine. E.g.:
rc --next # Play next track
rc --print-playing # Grab the name
Yes, it's useless.
Chronic Bash function:
chronic 3600 time # Print the time in your shell every hour
chronic 60 updatedb > /dev/null # update slocate every minute
Note: use 'jobs' to list background tasks and fg/bg to take control of them.
Greps IRC logs for phrases and lists users who said them.