Invoke Command Computer Name not valid error when passing from variable

Question

I running some test on Invoke Command and found some interesting result.

This is the success code snippet.

Invoke-Command  -ComputerName serverA,serverB,serverC,serverD,serverE -ScriptBlock{Get-WindowsUpdate | Format-Table -AutoSize}

This is the code snippet which return error.

$servers="serverA,serverB,serverC,serverD,serverE"
Invoke-Command  -ComputerName $servers -ScriptBlock{Get-WindowsUpdate | Format-Table -AutoSize}

Error Message:

Invoke-Command : One or more computer names are not valid. If you are trying to pass a URI, use the -ConnectionUri parameter, or pass URI objects instead of strings.

Why there is an error occur when read from variables? How to fix it?

Ivan Mirchev · Accepted Answer · 2020-05-21 06:24:58Z

2

Parameter Computers accepts collection of strings. The comma is regarded as a separator, to build a collection. Using it as: $servers="serverA,serverB,serverC,serverD,serverE" is one large string, containing commas, not a collection of strings.

It should be: $servers="serverA","serverB","serverC","serverD","serverE"

answered May 21, 2020 at 6:24

Ivan Mirchev

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