touch togags; open togags

chmod u+x togags

$ togags
   Automatic Graphics Switching is: OFF
$ togags
   Automatic Graphics Switching is: ON
$

#!/usr/bin/osascript

if running of application "System Preferences" then
    try
        quit application "System Preferences"
    on error
        do shell script "killall 'System Preferences'"
    end try
end if

repeat while running of application "System Preferences" is true
    delay 0.1
end repeat

tell application "System Preferences"
    reveal pane id "com.apple.preference.energysaver"
    repeat until exists window "Energy Saver"
        delay 0.1
    end repeat
end tell

tell application "System Events" to tell ¬
    group 1 of window "Energy Saver" of application process "System Preferences"
    repeat until exists checkbox "Automatic graphics switching"
        delay 0.1
    end repeat
    click checkbox "Automatic graphics switching"
    set cbAGS to (value of checkbox "Automatic graphics switching") as boolean
end tell

quit application "System Preferences"

if cbAGS then
    return "   Automatic Graphics Switching is: ON"
else
    return "   Automatic Graphics Switching is: OFF"
end if