gistfile1.applescript

tell application "Google Chrome"
  set aWin to make new window with properties {mode:"incognito"}
  tell aWin
    make new tab with properties {URL:"http://www.wuputah.com"}
    close tab 1
  end tell
  activate
end tell

gistfile2.sh

#!/bin/sh

osascript - <<EOF
tell application "Google Chrome"
  set aWin to make new window with properties {mode:"incognito"}
  tell aWin
    make new tab with properties {URL:"$1"}
    close tab 1
  end tell
  activate
end tell
EOF