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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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cat large file to clipboard with speed-o-meter
shortest alternative without the speed-o-meter"xclip large.xml" "xclip -o" to get the clipboard content, alternatively [shift key] + insert or middle button of your mouse.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Get all ip address for the host

Switch to the previous branch used in git(1)
Very useful if you keep switching between the same two branches all the time.

doing some floating point math

Remind yourself to leave in 15 minutes
If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM

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" }

rgrep: recursive grep without .svn
Only excludes .svn from filenames.

Download certificate chain from FTP


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