Greps for a port in netstat output

checkPortUsage.sh

#!/bin/bash

_printUsage() {
    echo 'Usage: checkPortUsage.sh <port>'
}

### Main ###

if [[ $# -ne 1 ]]; then
    _printUsage
    exit 1
fi

sudo netstat -ltnp | head -n 2; sudo netstat -ltnp | grep -w ":$1"