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permanently let grep colorize its output
This will create a permanent alias to colorize the search pattern in your grep output

list files recursively by size

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

Recursively grep thorugh directory for string in file.
-R, -r, --recursive Read all files under each directory, recursively; this is equivalent to the -d recurse option.

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"

Kill process by pid
To kill a process in windows by using the PID. Change 10728 to the PID of the process you want to kill.

check open ports without netstat or lsof

Down for everyone or just me?
Check if a site is down with downforeveryoneorjustme.com

Perl one-liner to determine number of days since the Unix epoch
There are some environments that use this value for password and account expiration. It's helpful to be able to quickly determine the number of days since the Unix epoch (dse) when working directly with the configuration files as an administrator.

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