Extract Specific Filetypes From Multiple Zips to one Folder in Powershell

Question

I have Several zip files that Contain multiple filetypes. The ONLY ones I am interested in are the .txt files. I need to extract the .txt files only and place them in a fold

Answer 1

Use the ZipArchive type to programmatically inspect the archive before extracting:

Add-Type -AssemblyName System.IO.Compression

$destination = "C:\destination\folder"

# Locate zip file
$zipFile = Get-Item C:\path\to\file.zip

# Open a read-only file stream
$zipFileStream = $zipFile.OpenRead()

# Instantiate ZipArchive
$zipArchive = [System.IO.Compression.ZipArchive]::new($zipFileStream)

# Iterate over all entries and pick the ones you like
foreach($entry in $zipArchive.Entries){
    if($entry.Name -like '*.txt'){
        # Create new file on disk, open writable stream
        $targetFileStream = $(
            New-Item -Path $destination -Name $entry.Name -ItemType File
        ).OpenWrite()

        # Open stream to compressed file, copy to new file stream
        $entryStream = $entry.Open()
        $entryStream.BaseStream.CopyTo($targetFileStream)

        # Clean up
        $targetFileStream,$entryStream |ForEach-Object Dispose
    }
}

# Clean up
$zipArchive,$zipFileStream |ForEach-Object Dispose

Repeat for each zip file.

Note that the code above has very minimal error-handling, and is to be read as an example