Test::TCP::CheckPort(3)
check if a port is open from command line
SYNOPSIS
$^X -MTest::TCP::CheckPort -echeck_port 8080
DESCRIPTION
This is a wrapper for Net::EmptyPort which checks if a given port
is open, from the command line argument (@ARGV). Because it works
with port numbers in the argument list, you don't need to quote it
when running with the perl executable.