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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" }

check open ports without netstat or lsof

Forget remembered path locations of previously ran commands
i.e.: Useful if you add ~/bin to your $PATH and you want to override locations of previously ran commands and you don't want to log out and log back in to be able to use them.

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 absolut path to your bash-script
Another way of doing it that's a bit clearer. I'm a fan of readable code.

BIGGEST Files in a Directory
Find biggest files in a directory

Get IP from hostname

prevents replace an existing file by mistake
Use set +o noclobber and you will be able to replace files again

Command to rename multiple file in one go
An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.


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