Checking exit code of last command using "if" statement

Question

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

The last command execute was:

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

The output is:

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   

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

Answer 1

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 

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

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

$x=gci $? 

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

Answer 2

From Get-Help about_If:

Syntax The following example shows the If statement syntax:

   if (<test1>)        {<statement list 1>}    [elseif (<test2>)        {<statement list 2>}]    [else        {<statement list 3>}] 

Note: the square brackets around the elseif and else indicate they are optional.

Assign your returned object to a variable:

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

Then

if ($Result.ExitCode -eq 0)   {     #More commands   }