Laravel Valet Share with Sub-Domain Support

tunnel-valet.sh

# Tunnels to valet project with custom domain name.
# Uses ngrok.com with my personal github account and auth token
function tunnel_valet() {
    HOST="${PWD##*/}"
    DOMAIN=$(valet domain)
    SUBDOMAIN="$HOST"
    [[ "$1" ]] && SUBDOMAIN=$1;

    for linkname in ~/.valet/Sites/*; do
        if [[ "$(readlink $linkname)" = "$PWD" ]]
        then
            HOST="${linkname##*/}"
        fi
    done

    # Fetch Ngrok URL In Background...
    bash valet fetch-share-url &
    sudo -u $(logname) ngrok http "$HOST.$DOMAIN:80" -subdomain="$HOST" -host-header=rewrite ${*:2}
    exit
}

can you guild how to run this?