open new iTerm tab and change directory.

new_iterm_tab.scpt

#!/usr/bin/osascript                                                            
# open new iTerm tab and change directory.
set current_dir to do shell script "pwd"
tell application "iTerm"
        tell application "System Events"
                tell process "iTerm" to keystroke "t" using command down
        end tell
        tell the current terminal
                tell the last session
                        write text "cd " & current_dir
                end tell
        end tell
end tell