使用“if"检查最后一个命令的退出代码陈述 [英] Checking exit code of last command using "if" statement

问题描述

我想检查最后一条命令的状态，并根据退出代码，进一步执行命令.

I want to check the status of last command and based on the exit code, the commands will be executed further.

最后执行的命令是:

$hiveJob = Start-AzureHDInsightJob -Cluster $clusterName -JobDefinition  $hiveJobDefinition
Wait-AzureHDInsightJob -Job $hiveJob -WaitTimeoutInSeconds 5400
Get-AzureHDInsightJobOutput -Cluster $clusterName -JobId $hiveJob.JobId -StandardOutput

输出为:

Cluster         : crmhdinsight  
ExitCode        : 0  
Name            : Hive: show tables;  
PercentComplete :   
Query           : show tables;  
State           : Completed  
StatusDirectory : 7dc4b67f-99a9-4c6b-a9f3-ffe8b4e29c7e  
SubmissionTime  : 7/28/2014 11:44:04  
AMJobId         : job_1406103802152_0053  

现在，我只想在退出代码为零时执行更多命令.如何为这种情况编写 if 语句?

Now, I want to execute further commands only if the exitcode is zero. How do I write an if statement for this condition?

推荐答案

您说的是退出代码".如果你的意思是 $LastExitCode 自动变量，它是仅在您调用 windows 程序时填充，例如 RAR:

You're talking about "exit code". If you mean $LastExitCode automatic variable, it is only populated when you call windows program, RAR for example:

$x=rar
$LastExitCode

它将返回退出代码 7(如果您安装了 RAR).

It will return exit code 7 (if you have RAR installed).

但是，cmdlet 不会填充此变量.您可以为此使用另一个自动变量 $?:

cmdlets, however, don't fill this variable. You can use another automatic variable $? for this:

$x=gci
$?

如果命令成功完成，它只会给出 $True 或者如果出现错误则给出 $False.

It only gives $True if command completed successfully or $False if there was an error.

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