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Check open TCP and UDP ports
There are 2 alternatives - vote for the best!
Tested in Linux and OSX
While `lsof` will work, why not use the tool designed explicitly for this job?
(If not run as root, you will only see the names of PID you own)
This option selects the listing of all Internet and x.25 (HP-UX) network files.
This option is much faster, as it checks only network nodes.
If you can do better, submit your command here.
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