Merge Zip Files to 7z

This script will retrieve all zip files in a directory, unzip them one at a time into new directories, then add those directories to a .7z file. Useful if you have a collection of zip files with mostly the same contents, where you’ll benefit from combining them together, but you don’t have enough disk space to unzip all of them at once.

param(
    [Parameter(Position=0,Mandatory)]
    [string]$OutputBaseFileName
)

# Set these two constant values:

$SevenZipExe = "C:\Program Files\7-zip\7z.exe"
$Dir = "C:\temp\je"

$ZipFiles = Get-ChildItem -Path "$($Dir)\*" -Include "*.zip"
$OutputFile = "$($Dir)\$($OutputBaseFileName).7z"

$ZipFiles | ForEach-Object {
    $ZipFileName = $_.FullName
    $DirName = $_.FullName -replace "\.zip$", ""
    Start-Process -FilePath $SevenZipExe -ArgumentList "x `"$ZipFileName`" -o`"$DirName`"" -Wait -NoNewWindow
    Start-Process -FilePath $SevenZipExe -ArgumentList "a `"$OutputFile`" `"$DirName`"" -Wait -NoNewWindow
    Remove-Item -Recurse -Path $DirName
}