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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"

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"

Number of CPU's in a system
this works for a Linux based system, other UNIX systems may have other way(s) to check the number of CPUs.

Install pip with Proxy
Installs pip packages defining a proxy

Generate list of words and their frequencies in a text file.

Print a list of installed Perl modules
Works only if modules are installed "the right way"

Job Control
background and disown, but with a proper one-line syntax

List last opened tabs in firefox browser

Real full backup copy of /etc folder
Yes, rsync(1) supports local directories. And, should anything change, it's trivial to run the command again, and grab only the changes, instead of the full directory.

Get backup from remote host, then expand in current directory using tar


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