Quick guide to GNU screen

Start a screen session

$screen

Detach from the screen session

Ctrl+a d
(Hit Ctrl+a quickly followed by hitting just d)

List current screen sessions
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How do I scan UDP ports?

Off late, a couple of friends at work are asking me how to check if we can connect to a port on a remote host. They have tried telnet-ing to the port but it does not work because they are UDP ports. After a bit of googling and reading the man page, this is how we can scan UDP ports using nc and nmap.
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