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Find wich ports you probably want to open in your firewall on a fresh installed machine

eavesdrop
Record off the microphone on a remote computer and listen to it live through your speakers locally.

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"

Recursively remove all empty directories

Extract public key from private
This will extract the public key that is stored in the private key using openssl.

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

Retrieve "last modified" timestamp of web resource in UTC seconds
This command line assumes that "${url}" is the URL of the web resource. It can be useful to check the "freshness" of a download URL before a GET request.

Download all Delicious bookmarks

Remove the first character of each line in a file

Print the IP address and the Mac address in the same line
Print the IP address and the Mac address in the same line


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