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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
Ever needed to test firewalls but didn't have netcat, telnet or even FTP?
Enter /dev/tcp, your new best friend. /dev/tcp/(hostname)/(port) is a bash builtin that bash can use to open connections to TCP and UDP ports.
This one-liner opens a connection on a port to a server and lets you read and write to it from the terminal.
How it works:
First, exec sets up a redirect for /dev/tcp/$server/$port to file descriptor 5.
Then, as per some excellent feedback from @flatcap, we launch a redirect from file descriptor 5 to STDOUT and send that to the background (which is what causes the PID to be printed when the commands are run), and then redirect STDIN to file descriptor 5 with the second cat.
Finally, when the second cat dies (the connection is closed), we clean up the file descriptor with 'exec 5>&-'.
It can be used to test FTP, HTTP, NTP, or can connect to netcat listening on a port (makes for a simple chat client!)
Replace /tcp/ with /udp/ to use UDP instead.
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