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run command on a group of nodes in parallel
Parallel is from https://savannah.nongnu.org/projects/parallel/ Other examples would be: (echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute seq -f %04g 0 9999 | parallel -X rm pict{}.jpg

Show what PID is listening on port 80 on Linux

stream a youtube video with mpv where $1 is the youtube link.
opens a new session with video stream

Backup VPS disk to another host

Display unique values of a column
the column number is '6'

Annotate tail -f with timestamps
Uses the command ts in order to add a timestamp on each line. This command is provided in the moreutils package on Debian, and you may need libtime-duration-perl to be able to format the date.

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"

Stripping ^M at end of each line for files

Get last sleep time on a Mac

Colorize grep output


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