Send keystroke command to Mac OS application

keystroke.scpt

-- run with "osascript keystroke.scpt APPNAME KEY MODIFIER"

on run params
	set frontApp to (path to frontmost application as text)
	set appl to item 1 of params
	set keyy to item 2 of params
	
	if frontApp is not equal to appl then
		
		tell application appl
			reopen
			activate
		end tell
		
		repeat until application appl is running
			delay 1
		end repeat
		delay 0.5
	end if
	
	if (count of params) is greater than 2 then
		
		set m to item 3 of params
		if m is equal to "command" then
			set modifier to command down
		else if m is equal to "shift" then
			set modifier to shift down
		else if m is equal to "option" then
			set modifier to option down
		else if m is equal to "control" then
			set modifier to control down
		end if
		
		tell application "System Events" to keystroke keyy using modifier
	else
		tell application "System Events" to keystroke keyy
	end if
	
	(*
		LEFT: (key code 123)
		RIGHT: key code 124)
		UP: (key code 126)
		DOWN: (key code 125)
	*)
	
end run