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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" }

Watch the progress of 'dd'
run this in another terminal, were xxxx is the process ID of the running dd process. the progress will report on the original terminal that you ran dd on

Perform a C-style loop in Bash.
Print 0 through 99, each on a separate line.

See system users

Move all files in subdirectories to current dir

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

Get all IPs via ifconfig

Share your terminal session real-time
One person does `mkfifo foo; script -f foo' and another can supervise real-time what is being done using `cat foo'.

Mysql uptime
show Mysql uptime

Run a long job and notify me when it's finished
You will need libnotify-bin for this to work: $ sudo aptitude install libnotify-bin


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