Question

我正在尝试在后台运行scala控制台中的守护进程。我可以让它运行该程序，但它在运行时锁定控制台窗口，因此迫使我使用单独的窗口来停止守护程序以解锁原始控制台。我通过sbt在Windows PowerShell中运行scala控制台。

我可以使用命令提示符在后台使用start /b program成功运行程序，但在scala控制台中运行("start /b program").!失败。

这将在scala控制台中运行程序，但会锁定窗口： ("cmd /c start program").!

如何让程序在后台成功运行，这样我仍然可以访问当前的控制台？我一直在使用/E:ON使用/b作为start的扩展，但无济于事。

这些是来自cmd /?

的结果

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\>cmd /?
Starts a new instance of the Windows XP command interpreter

CMD [/A | /U] [/Q] [/D] [/E:ON | /E:OFF] [/F:ON | /F:OFF] [/V:ON | /V:OFF]
    [[/S] [/C | /K] string]

/C      Carries out the command specified by string and then terminates
/K      Carries out the command specified by string but remains
/S      Modifies the treatment of string after /C or /K (see below)
/Q      Turns echo off
/D      Disable execution of AutoRun commands from registry (see below)
/A      Causes the output of internal commands to a pipe or file to be ANSI
/U      Causes the output of internal commands to a pipe or file to be
        Unicode
/T:fg   Sets the foreground/background colors (see COLOR /? for more info)
/E:ON   Enable command extensions (see below)
/E:OFF  Disable command extensions (see below)
/F:ON   Enable file and directory name completion characters (see below)
/F:OFF  Disable file and directory name completion characters (see below)
/V:ON   Enable delayed environment variable expansion using ! as the
        delimiter. For example, /V:ON would allow !var! to expand the
        variable var at execution time.  The var syntax expands variables
        at input time, which is quite a different thing when inside of a FOR
        loop.
/V:OFF  Disable delayed environment expansion.

Answer 1

你应该在SBT中使用forking，这正是它的用途。

根据您的情况，在SBT版本中设置此设置：

fork in run := true

默认情况下，stdin不会连接到分叉进程，启用它：

connectInput in run := true

Answer 2

感谢@ som-snytt链接@ michael.kebe关于此SO条目的答案：How does the “scala.sys.process” from Scala 2.9 work?

val pb = Process("""program""").run

完全符合我的要求

在scala控制台的背景中运行守护进程

2 个答案: