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Generate random valid mac addresses
Python Alternative

Switch to the previous branch used in git(1)
Very useful if you keep switching between the same two branches all the time.

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"

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" }

save command output to image
It's just because the original command was not working on version's 6.7.7-10.

Binary clock

detect the fastest ldap server on a intranet
This command line detect ldap hosts, by mandatory dns entry, then ping them to detect response average. based on ping response average it sorts and print the faster server in first output line

convert png into jpg using imagemagick

Get your outgoing IP address

Get current Xorg resolution via xrandr
Not sure if it works the same on any shell.


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