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Find the package that installed a command

Simultaneously running different Firefox profiles
After running $ firefox -ProfileManager and creating several different profiles, use this command to run multiple Firefox profiles simultaneously.

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

Write a shell script that removes files that contain a string
Deletes files in the current directory or its subdirectories that match "regexp" but handle directories, newlines, spaces, and other funky characters better than the original #13315. Also uses grep's "-q" to be quiet and quit at the first match, making this much faster. No need for awk either.

diff two unsorted files without creating temporary files
bash/ksh subshell redirection (as file descriptors) used as input to diff

Bytebeat
Never ending music, generated via a C snippet, piped to aplay. Taken from: http://canonical.org/~kragen/bytebeat/

execute your commands and avoid history records
$ secret_command;export HISTCONTROL= This will make "secret_command" not appear in "history" list.

Show the number of current httpd processes

Colored cal output

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" }


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