在Windows批处理文件斯卡拉脚本 [英] Scala scripts in Windows batch files

问题描述

在Scala编程，它提供了有关如何运行批处理文件斯卡拉脚本（的链接）。

In Programming in Scala, it gives a description on how to run Scala scripts from batch files (link).

对于Windows

  ::#!
  @echo off
  call scala %0 %*
  goto :eof
  ::!#

我有谷歌搜索问题 ::＃！。这是什么意思？我知道：表示注释和Unix的＃！是要用于外壳一个方向，但什么是不是正是这里？和 ::＃！？

I'm having a problem googling ::#!. What does this mean? I know :: denotes a comment and in Unix #! is a direction to the shell to be used, but what is it exactly here? And the ::!#?

这到底是什么％0％* 的意思，而且是有必要的前preSS是这样吗？

What exactly does %0 %* mean, and is it necessary to express it like this?

是否有可能从同一个批处理文件运行多个脚本？

Is it possible to run multiple scripts from the same batch file?

推荐答案

这是一个噱头，但它的作品。它打算复制的Unix shell的调用特定命令来处理一个shell文件的能力。所以，这里的解释是：

This is a gimmick, but it works. It intends to replicate Unix shell's ability to invoke a particular command to process a shell file. So, here's the explanation:

::#!

与启动：是Windows Shell中的意见，所以这只是一个评论。行

Lines starting with :: are comments in Windows shell, so this is just a comment.

@echo off

不显示从这里开始执行的行。在 @ 开头确保这条线本身将不会被显示。

Don't show lines executed from here on. The @ at the beginning ensure this line itself won't be shown.

call scala %0 %*

执行权转交给斯卡拉脚本。在％0 表示这个文件本身的名称（以便斯卡拉可以找到它），而％* 是参数在执行过程中被通过了。

Transfer execution to the scala script. The %0 means the name of this file itself (so that scala can find it), and %* are the parameters that were passed in its execution.

举例来说，说这些线在一个名为 count.bat ，并通过键入调用它数1 2 3 。在这种情况下，该行会执行阶数1 2 3 - 在这种情况下，你会得到一个错误。你必须通过键入调用它 count.bat 。

For example, say these lines are in a file called count.bat, and you invoked it by typing count 1 2 3. In this case, that line will execute scala count 1 2 3 -- in which case you'll get an error. You must invoke it by typing count.bat.

goto :eof

完成执行脚本。

::!#

另一个注释行。

所以，这里的诀窍...斯卡拉，调用一次，会发现作为第一个参数传递的文件，检查第一行是 ::＃！，不顾一切到行 ::＃！如果是这样，然后执行该文件的其余部分（在行::＃！）作为Scala的脚本。

So, here's the trick... Scala, once invoked, will find the file passed as the first argument, check if the first line is ::#!, ignore everything up to the line ::!# if so, and then execute the rest of the file (the lines after ::!#) as a Scala script.

在换句话说，它不是Windows的外壳，是聪明的，它的斯卡拉。 ： - ）

In other words, it is not the Windows shell that is smart, it's Scala. :-)

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