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

extract content of a Debian package

Install pip with Proxy
Installs pip packages defining a proxy

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" }

Copy all documents PDF in disk for your home directory
I used this to copy all PDFs recursively to a selected dir

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Alternative size (human readable) of files and directories (biggest last)

Emergency Alien Invasion Warning
When aliens invade Earth, be first to warn your neighbours by placing your computer screen at a window and executing this potentially Earth-saving command. Ctrl C when aliens are defeated.

Check if the files in current directory has the RPATH variable defined
Using gentoo prefix portage I got in a situation where some packages did not contain the needed RPATH variable. This command helped me to find out which ones I should recompile

Generate Random Text based on Length
Random text of length "$1" without the useless cat command.


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