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#!/usr/bin/perl
use 5.014;
# 990400
...
 18    1G/10G    full      no     no      down      18      
 19     1000     full      no     no       up       19      
 20    10000     full      no     no      down      20

C:\> 990400.pl
port is 10, speed is 10000, link is up
port is 19, speed is  1000, link is  up