https://macmule.com/2011/09/09/how-to-turn-off-wireless-card/

turnOffWireless.sh

#!/bin/sh
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#
# License: https://macmule.com/license/
#
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#
# DEFINE VARIABLES
#
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# HARDCODED VALUES SET HERE
# Set to y to clear DNS for macs running Tiger
clearTiger="n"

# CHECK TO SEE IF A VALUE WAS PASSED IN PARAMETER 4 AND, IF SO, ASSIGN
if [ "$4" != "" ] && [ "$clearTiger" == "" ];
then
    clearTiger=$4
fi

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#
# SCRIPT CONTENTS - DO NOT MODIFY BELOW THIS LINE
#
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# Gets OS Version
OS=`/usr/bin/defaults read /System/Library/CoreServices/SystemVersion ProductVersion | awk '{print substr($1,1,4)}'`

# Checks networksetup to see if an Airport Card is installed
checkHasAnAirportCard=`networksetup -listallhardwareports | grep -i "Hardware Port: Air" | cut -c 16-`

# Checks to see if their is a service created for Airport, & if so gets the name
checkWireless=$(networksetup -listallhardwareports | egrep "Hardware Port: (Air|Wi-)" | cut -c 16-)

# Checks to see if Airport is installed
if [ -z "$checkWireless" ];
then
    # If no Wireless is installed
    echo "No Wireless Card exiting..."
    exit 0
else
    # Checks to see if Wireless has a service created for it.
    if [ -z "$checkWireless" ];
    then
        # If Aiport is installed, but does not have a service create a service & enable
        echo "Wireless installed, but not configured as a service..."
        # Creates Aiport service
        networksetup -createnetworkservice "$checkWireless" "$checkWireless"
        echo "Wireless service created..."
        #Enable Wireless
        networksetup -setnetworkserviceenabled "$checkWireless" on
        echo "Enabled Wireless service..."
    fi
fi

#Loops through the list of network services
for i in $(networksetup -listallnetworkservices | tail +2 );
do
    #Checks to see if there is a service called *Airport* or *Wireless if so enables it.
    if [[ "$i" =~ '*A' || "$i" =~ '*W' ]];
    then
        #Removes the * prefix
        disabledServices=`( echo $i | cut -c 2- )`
        #Enables the disabled netwoprk services
        /usr/sbin/networksetup -setnetworkserviceenabled "$disabledServices" on
        #Echo's the name of any services enabled
        echo "Wireless now enabled..."
    fi
done

# Re-checks the service name for Wireless as it should now be enabled
checkWirelessIsAService=$(networksetup -listallnetworkservices | egrep -i "(Air|Wi-)")

#Checks power state of Wireless
if [[ "$OS" "10.5" ]];
then
    # If OS is 10.6.x run the following to check Wireless power...
    airportPower=`/usr/sbin/networksetup -getairportpower "$checkWireless" | cut -c 26-`
else
    # If OS is 10.5.x run the following to check Wireless power...
    airportPower=`/usr/sbin/networksetup -getairportpower | cut -c 16-`
fi

if [[ "$airportPower" == "Off" ]];
then
    #Checks to see if Wireless is off & if so.. exits.
    echo "Wireless already powered off.. exiting..."
    exit 0
else
    #Checks to see if Wireless is on
    echo "Wireless is powered on..."
    # If machine is running Tiger, clear search domains if specified for $clearTiger variable
    if [[ "$OS" < "10.5" ]];
    then
        if [[ "$clearTiger" == "y" ]];
        then
            echo "Clearing DNS Servers for OS $OS..."
            /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/networksetup -setdnsservers "$checkWireless" "empty"
            echo "Clearing search domains for OS $OS..."
            /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/networksetup -setsearchdomains "$checkWireless" "empty"
        else
            echo "Not Clearing DNS as OS is $OS..."
        fi
    else
        # If machine is not running 10.5 or higher clear dns & search domains as these will be picked up by DHCP
        echo "Clearing DNS Servers for OS $OS..."
        /usr/sbin/networksetup -setdnsservers "$checkWireless" "empty"
        echo "Clearing search domains for OS $OS..."
        /usr/sbin/networksetup -setsearchdomains "$checkWireless" "empty"
    fi
    if [[ "$OS" == "10.4" ]];
    then
        # If OS is 10.4.x run the following to turn off Wireless...
        echo "Turning off the Wireless for OS $OS..."
        /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/networksetup -setairportpower off
        exit 0
    elif [[ "$OS" == "10.5" ]];
    then
        # If OS is 10.5.x run the following to turn off Wireless...
        echo "Turning off the Wireless for OS $OS..."
        /usr/sbin/networksetup -setairportpower off
        exit 0

    elif [[ "$OS" == "10.6" ]];
    then
        # If OS is 10.6.x run the following to turn off Wireless...
        echo "Turning off the Wireless for OS $OS..."
        /usr/sbin/networksetup -setairportpower "$checkWireless" off
        exit 0
    else
        # If OS is 10.7.x or greater then run the following to turn off Wireless...
        checkWireless=$(networksetup -listallhardwareports | egrep "Hardware Port: (Air|Wi-)" | cut -c 16-)
        # First we need to get the Wi-Fi device's name
        wifiDevice=`/usr/sbin/networksetup -listallhardwareports | awk '/^Hardware Port: Wi-Fi/,/^Ethernet Address/' | head -2 | tail -1 | cut -c 9-`
        echo "Turning off the Wireless for OS $OS..."
        /usr/sbin/networksetup -setairportpower "$wifiDevice" off
        exit 0
    fi
fi