Piping cmd output to variable in PowerShell

Question

I have the following in a PowerShell script:

cmd /c npm run build-release 
$succeeded = $LastExitCode

What I'd like to do is:

Pipe the output of the cmd to a variable so it doesn't write to the host
Only if $succeeded is eq $true, Write-Host the output variable from that the cmd

How can this be done?

arco444 · Accepted Answer · 2015-04-01 17:30:27Z

1

Use Invoke-Expression:

$output = Invoke-Expression "cmd /c npm run build-release"
$succeeded = $LastExitCode

if($succeeded -eq 0) {
  write-output $output
}

answered Apr 1, 2015 at 17:30

arco444

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2 Comments

Matt Over a year ago

I wouldn't have thought you actually need Invoke-Expression for this. Does it have to do with how npm works? $results = ping 127.0.0.1 works fine for example

arco444 Over a year ago

@Matt I think its better from a readability point of view - it's more clear your calling something external. Its also useful if the command was ever built into a variable.

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