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List open IPv4 connections

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" }

List all process running a specfic port
List all process running a specfic port

Check the package is installed or not. There will show the package name which is installed.
The ^python$ is a package name patten. You can change whatever you want.

Echo the latest commands from commandlinefu on the console
Self-referential use of wget.

Run the last command as root
this command also can run the last command as root what's more, sudo !-2 can run the second last command as root , and so on

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

Matrix Style
It's the same command as submitted, but first with a command to make all characters green. It's the only way it looked "matrix-like" on my gnome-terminal.

colored tail

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


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