A wifi utility for Mac that gets status and sets state. To use you have to place the airport binary in your path per these instructions http://osxdaily.com/2007/01/18/airport-the-little-known-command-line-wireless-utility/

wifi.sh

#!/bin/bash

# Run this command to link airport into the path
# sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport

if [ "$1" == "status" ]
then
    out=$(airport -I)
    if [ "$out" == "AirPort: Off" ]
    then
        echo "Status: off"
    else
        echo "Status: on"
    fi
else
    if [ "$1" == "on" ]
    then
        networksetup -setairportpower en1 on
    elif [ "$1" == "off" ]
    then
        networksetup -setairportpower en1 off
    else
        #If it gets here, none of the arguments were correct
        echo "Usage: wifi [status|on|off]"
    fi
fi