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------------------------------------------------------------------
Port   Speed    Duplex     Flow Ctrl      Link       Name
...
 18    1G/10G    full      no     no      down      18      
 19     1000     full      no     no       up       19      
 20    10000     full      no     no      down      20

open FILE,"interfacelink.txt" or die "cannot open file : $!";
#my $substring = "encap:";   #this is useful if search istring is long
...

 }
}

port is=Port
speed is=Speed
...
port is= 19
speed is= 1000
link is= up