List ReverseSSH ports

sudo lsof -i -n | grep sshd | grep sshuser | grep :[PORT-RANGE] | grep -v IPv6 | awk -F\: '{print $2}' | grep -v http | awk -F" " '{print $1}'
gets network ports only ones for the sshd service only logged in a specific user (changed for public posting) only in a specific localhost:port range not IPv6 Only the part of the response after the ":" character Only the part of the response before the 1st space Output is just the rssh port

By: das_shark
2015-04-09 15:41:11

What Others Think

I'm not sure what you're trying to do exactly... but putting four greps in a row (where one would do just fine) is hardly a commandline fu. Also, grep :[10000-19999] certainly doesn't do what you want it to do (limit to ports in 10k-20k range), because it will match semicolon followed by 0,1, or 9. You could use ':1[0-9]{4}', check this example: echo -e '10300\n20000\n100 \n800' | egrep '^1[0-9]{4}$' And then, awk's -F parameter takes a regexp (say -F'[: ]+') and awk can easily filter based on input (the way grep does) so you don't really have to put two awks interspersed with another grep. Check this out: echo -e "oh:hey there\noh http:no\n1:there:buddy" | awk -F'[ :]+' '$0!~/http/ {print $2}' (will print "hey\nthere")
wejn · 353 weeks and 3 days ago
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stevematt · 51 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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