最近在整理去沖繩的照片，想要同時開兩個 PhotoScapeX 的視窗，

一個視窗用來瀏覽所有的照片，把要用在網誌上的複製到一個目錄；

而另一個視窗，則用來調整那目錄裡的圖片～

可是，如果在 PhotoScapeX 的圖示上按右鍵，並沒有什麼選項可以再開一個視窗…

(不像 Windows 是可以按右鍵 > 點應用程式的名稱，就能再開一個)

上網查了一下，原來要做到也蠻容易的，只是要下指令～

打開終端機 (terminal)，執行 open 看一下用法：

testuser@localhost ~/ $ open

Usage: open [-e] [-t] [-f] [-W] [-R] [-n] [-g] [-h] [-s ][-b ] [-a ] [filenames] [--args arguments]
Help: Open opens files from a shell.
      By default, opens each file using the default application for that file.
      If the file is in the form of a URL, the file will be opened as a URL.

Options:
      -a                Opens with the specified application.
      -b                Opens with the specified application bundle identifier.
      -e                Opens with TextEdit.
      -t                Opens with default text editor.
      -f                Reads input from standard input and opens with TextEdit.
      -F  --fresh       Launches the app fresh, that is, without restoring windows. Saved persistent state is lost, excluding Untitled documents.
      -R, --reveal      Selects in the Finder instead of opening.
      -W, --wait-apps   Blocks until the used applications are closed (even if they were already running).
          --args        All remaining arguments are passed in argv to the application's main() function instead of opened.
      -n, --new         Open a new instance of the application even if one is already running.
      -j, --hide        Launches the app hidden.
      -g, --background  Does not bring the application to the foreground.
      -h, --header      Searches header file locations for headers matching the given filenames, and opens them.
      -s                For -h, the SDK to use; if supplied, only SDKs whose names contain the argument value are searched.
                        Otherwise the highest versioned SDK in each platform is used.

我們會用到 -n 這個選項，用來強制開啟一個新的視窗。

如果不加這選項的話，如果程式已經開啟了，就不能再執行另外一份複本。

還會用到 -a 選項，用來指定應用程式的名稱。

像我想要再開一個 PhotoScapeX 的視窗，就執行下面的指令：

open -n -a PhotoScapeX

這時就出現第二個 PhotoScape 的視窗囉，圖示也有兩個：

參考資料：Launch & Run Multiple Instances of Any Application in Mac OS X