在Windows PowerShell中有条件地执行过程(例如Bash中的&&和||运算符) [英] Execute process conditionally in Windows PowerShell (e.g. the && and || operators in Bash)

问题描述

我想知道是否有人知道根据前一个程序的退出成功/失败有条件地执行程序的方法.如果在没有测试LASTEXITCODE变量的情况下成功退出了program1，我有什么办法可以在program1之后立即执行program2?我试过-band和-and运算符无济于事，尽管我觉得它们无论如何都不会工作，最好的替代方法是分号和if语句的组合.我的意思是，当涉及到从Linux上的源代码自动构建软件包时，&&操作员不能被打败:

I'm wondering if anybody knows of a way to conditionally execute a program depending on the exit success/failure of the previous program. Is there any way for me to execute a program2 immediately after program1 if program1 exits successfully without testing the LASTEXITCODE variable? I tried the -band and -and operators to no avail, though I had a feeling they wouldn't work anyway, and the best substitute is a combination of a semicolon and an if statement. I mean, when it comes to building a package somewhat automatically from source on Linux, the && operator can't be beaten:

# Configure a package, compile it and install it
./configure && make && sudo make install

PowerShell将要求我执行以下操作，假设我实际上可以在PowerShell中使用相同的构建系统:

PowerShell would require me to do the following, assuming I could actually use the same build system in PowerShell:

# Configure a package, compile it and install it
.\configure ; if ($LASTEXITCODE -eq 0) { make ; if ($LASTEXITCODE -eq 0) { sudo make install } }

当然，我可以使用多行代码，将其保存在文件中并执行脚本，但是这样做的目的是要简洁(保存击键).也许这只是PowerShell和Bash(甚至包括支持&&运算符的内置Windows命令提示符)之​​间的区别，但是如果有更清洁的方法，我很乐意要知道.

Sure, I could use multiple lines, save it in a file and execute the script, but the idea is for it to be concise (save keystrokes). Perhaps it's just a difference between PowerShell and Bash (and even the built-in Windows command prompt which supports the && operator) I'll need to adjust to, but if there's a cleaner way to do it, I'd love to know.

推荐答案

您可以创建一个函数来执行此操作，但是据我所知没有直接的方法.

You could create a function to do this, but there is not a direct way to do it that I know of.

function run-conditionally($commands) {
   $ranAll = $false
   foreach($command in $commands) {
      invoke-command $command
      if ($LASTEXITCODE -ne 0) {
          $ranAll = $false
          break; 
      }
      $ranAll = $true
   }

   Write-Host "Finished: $ranAll"

   return $ranAll
}

然后将其称为

run-conditionally(@(".\configure","make","sudo make install"))

在没有方便的Powershell环境的情况下，可能会出现一些错误.

There are probably a few errors there this is off the cuff without a powershell environment handy.

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