Example applescript to run a sequence of commands in new Terminal tabs. In this case, running grunt js on paths relative to the applescript.

commands

tell application "Finder"
  activate
  
	set this_folder to (the target of the front window) as alias
	set dev_root to POSIX path of this_folder
	set directories to {"directory1", "directory2", "directory3"}
	
	tell application "Terminal"
		activate
		
		repeat with directory in directories
			
			tell application "System Events"
				tell process "Terminal"
					keystroke "t" using command down
				end tell
			end tell
			
			delay 1
			
			tell application "Terminal"
				do script "cd " & dev_root & "/" & directory & "; grunt" in the last tab of window 1
			end tell
			
			activate application "Terminal"
			
		end repeat
	end tell
end tell