在以前要打开文件都是先找到文件夹双击打开，打开某个文件夹也是的，今天突然发现在Mac上有个命令可以很轻送就打开文件或者文件夹，当然，前提是打开终端，哈哈，这个命令就是open命令。
示例:
open robots.txt
image
这样对文件进行编辑，很方便，保存一下就可以关闭文件了。
打开文件夹：
open css
这样很简单就把文件夹打开了。
下面是open命令的一些参数，可以自己动手试一试。
macdeMacBook-Pro:public mac$ open --help
open: unrecognized option `--help'
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.
