Hostname banning zsh function

gistfile1.bash

# assumes control of all hosts in /Local/Default/Hosts
# https://gist.github.com/1062860
hostoggle() {
    if (( ${#*} == 0 )); then
        # no host given, print current list of hosts banned
        dscl . -ls Hosts
    fi
    for host in "$@"; do
        if $(dscl . -read Hosts/$host >&- 2>&-); then
            # delete existing host records (raw and www-less)
            sudo dscl . -delete Hosts/$host
            [[ "$host" =~ "^www\." ]] && sudo dscl . -delete "Hosts/${host#www.}" >&- 2>&-
        else
            # create host record misdirection (raw and www-less)
            sudo dscl . -create Hosts/$host IPAddress 127.0.0.1
            [[ "$host" =~ "^www\." ]] && sudo dscl . -create "Hosts/${host#www.}" IPaddress 127.0.0.1
        fi
    done
}