Extract Zip files with PowerShell

Note: I got a lot of feedback about how it is possible to use Expand-Archive for this. While this is true, I wanted to have a solution that didn’t rely on any prerequisite except for what comes with .net. For this tool, I tried to create something that would run flawless on any systems, even if they removed core functionality like some of the system modules and libraries. This might not have come across when I originally wrote this, but hopefully the rest of the post will make sense now.

For my module tftools I needed to download Terraform from Hashicorp, which came in a Zip archive. I didn’t want to rely on other tools or modules to extract the Zip files, and luckily there was a .Net class called ZipFile from the System.IO.Compression.FileSystem assembly that could be utilized.

Here’s how we can download a Zip file as a temporary file and extract the content.

# Define a temporary file, 
# the URI for the file you want to download,
# and the folder you want to extract to
$tempFile = [System.IO.Path]::GetTempFileName()
$URI      = "https://example.org/file.zip"
$OutputFolder = "C:\folder"

# Download the file by using splatting*
$downloadSplat = @{
    uri             = $URI
    OutFile         = $tempFile
    UseBasicParsing = $true
}
Invoke-WebRequest @downloadSplat

# Load the assembly
Add-Type -AssemblyName System.IO.Compression.FileSystem

# Extract the content
[System.IO.Compression.ZipFile]::ExtractToDirectory($tempFile, $OutputFolder)

# And clean up by deleting the temporary file
Remove-Item -Path $tempFile

*If you haven’t heard of splatting, here is my blogpost about it: PowerShell tricks: Splatting

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About Roberth Strand

Cloud consultant working primarily with Microsoft Azure, automation and infrastructure.

Tromsø, Norway https://robstr.dev

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