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find an unused unprivileged TCP port
perl-less way

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

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" }

Lookup hostname for IP address

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

vim's pastetoggle: when you press f9 'paste' is on , press f9 again and 'paste' is off, and so forth (works in insert-mode and command-mode)

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Find the package that installed a command

Rename files in batch

Convert wma to mp3@128k
Convert all wma to mp3@128k with ffmpeg into directory.


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