PowerShell param is an empty string when it's not

Question

I'm trying to search through files for a string given in parameters by NodeJS.

param(
    [switch]$raw,
    [string]$input
)

[string]$file = "*.log"
if($raw) { $file = ".\raws\*.log" }

Get-ChildItem -Recurse -Include $file | select-string $input

The problem is that I'm getting the error that $input is empty:

What am I doing wrong?

$input is an automatic variable you shouldn't use that name in your code. Not sure if that's why it's breaking, but it's certainly misleading. — TessellatingHeckler
– TessellatingHeckler, Commented Feb 9, 2017 at 2:45
Possible duplicate of Strange difference between $_ and [parameter(ValueFromPipeline=$true)] — Ajay Pawar
– Ajay Pawar, Commented Feb 9, 2017 at 7:05

Farcrada · Accepted Answer · 2017-02-09 03:36:38Z

2

Thanks to @TessellatingHeckler for pointing out that $input is a reserved/automatic variable, and thus cannot be used like this.

answered Feb 9, 2017 at 3:36

Farcrada

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2 Comments

emkayultra Over a year ago

Oh man, such a lifesaver. I will note $profileName is also a reserved/automatic variable and I was having the same issue.

fourjr Over a year ago

For anyone stumbling across this thread, here is a list of automatic variables in Powershell

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