什么是PowerShell的等价猛砸的＆放大器;＆安培;和||运营商？ [英] What are the PowerShell equivalent of Bash's && and || operators?

问题描述

在猛砸我可以轻松地做这样的事情。

In Bash I can easily do something like

command1 && command2 || command3

这意味着运行Command1和在command1成功运行命令2，如果是command1无法运行指令代码。

which means to run command1 and if command1 succeeds to run command2 and if command1 fails to run command3.

什么是在PowerShell中的相同呢？

What's the equivalent in PowerShell?

推荐答案

什么猛砸必须做传递到逻辑运算符时隐式铸造的命令布尔的出口code。 PowerShell不会做到这一点 - 但可以做一个函数来包装命令，并创建相同的行为：

What Bash must be doing is implicitly casting the exit code of the commands to a Boolean when passed to the logical operators. PowerShell doesn't do this - but a function can be made to wrap the command and create the same behavior:

> function Get-ExitBoolean($cmd) { & $cmd | Out-Null; $? }

（ $？是包含上次退出$ C成功的布尔$ C ）

由于两个批处理文件：

#pass.cmd
exit

和

#fail.cmd
exit /b 200

...的行为可以被测试

...the behavior can be tested:

> if (Get-ExitBoolean .\pass.cmd) { write pass } else { write fail }
pass
> if (Get-ExitBoolean .\fail.cmd) { write pass } else { write fail }
fail

逻辑运算符应进行评估的方式与巴什一样。首先，设置一个别名：

The logical operators should be evaluated the same way as in Bash. First, set an alias:

> Set-Alias geb Get-ExitBoolean

测试：

> (geb .\pass.cmd) -and (geb .\fail.cmd)
False
> (geb .\fail.cmd) -and (geb .\pass.cmd)
False
> (geb .\pass.cmd) -and (geb .\pass.cmd)
True
> (geb .\pass.cmd) -or (geb .\fail.cmd)
True

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