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Some commands (such as netcat) have a port option but how can you know which ports are unused?
There are 9 alternatives - vote for the best!
Not really better - just different ;)
There's probably a really simple solution out there somewhere...
This is also perl-less, and only uses AWK as its postprocessor. Tested with GAWK and MAWK.
Should work with sh, bash, etc.
If you can do better, submit your command here.
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