How to replace of a specific line number

Question

I'm trying to replace line number 11 in a txt file using PowerShell.

Firstly I tried replacing a specific word, but it changed too much:

$output= (Resolve-DnsName -name name1).IPAddress 

(Get-Content "C:\test\test.txt") -replace "IPADDRESS=","IPADDRESS=$output"  | Set-Content C:\test\test.txt

Answer 1

For anyone finding that the above answer doesn't work for them, this works:

$content = Get-Content "C:\test\test.txt"
$contentUpdate = $content[10] -replace "IPADDRESS=","IPADDRESS=$output" 
Set-Content C:\test\test.txt $contentUpdate

Answer 2

$content = Get-Content "$file"
$content[$line - 1] = ($content[$line - 1] -replace "IPADDRESS=","IPADDRESS=$output")
Set-Content "$file" $content

This one worked for me.