List ReverseSSH ports
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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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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")