$ netstat -atn | awk ' /tcp/ {printf("%s\n",substr($4,index($4,":")+1,length($4) )) }' | sed -e "s/://g" | sort -rnu | awk '{array [$1] = $1} END {i=32768; again=1; while (again == 1) {if (array[i] == i) {i=i+1} else {print i; again=0}}}' 32768
perl-less way
Not really better - just different ;) There's probably a really simple solution out there somewhere... Show Sample Output
perl-based version
This is also perl-less, and only uses AWK as its postprocessor. Tested with GAWK and MAWK.
Should work with sh, bash, etc. Show Sample Output
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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