Extract zip file and concatenate the extracted content - powershell

Question

I have multiple zip files which I want to unzip and concatenate its content to a single file. I do not need each of these unzipped files thus prefer that they never get created if possible.
I need to do this in powershell and only have access to version 2.0.
Currently using 7zip to perform the unzipping. If I do the unzip without attempting to concatenate the output, I end up with all the extracted files using following command.
# all the zip files (10000 of them)
$logs = Get-ChildItem $folders[$i] -filter "*$stake).zip"
foreach ($log in $logs) {
Write-Host $log
& '7z' e $log
}
Attempting to concatenate all the files via following command but I still end up with all the extracted files and the combined.txt file contains repetition of following text. Please advice. Thanks.
# all the zip files (10000 of them)
$logs = Get-ChildItem $folders[$i] -filter "*$stake).zip"
foreach ($log in $logs) {
Write-Host $log
& '7z' e $log >> combined.txt
}
Text being repeated
7-Zip [64] 16.04 : Copyright (c) 1999-2016 Igor Pavlov : 2016-10-04
Scanning the drive for archives: 1 file, 7796 bytes (8 KiB)
Extracting archive: 0000_0000_0000 Game Log (name at 86% staking
25).zip
-- Path = 0000_0000_0000 Game Log (name at 86% staking 25).zip Type = zip Physical Size = 7796
Further clarifications:
I have 10000 zip files.
Upon extraction, each file content = "Hello".
I want to concatenate all these file contents into 1 single file.
Thus single file content will be -
"Hello"
"Hello"
"Hello"
... 10000 times
All I want is this single file which has the concatenated data.

Answer 1

AFAIK ZIP files need to be extracted before they can be read. Even in the case of ZIP browsers, when you "open" a file in it the file is extracted to a temporary location first.
So that's basically what you need to be doing:
$logs = Get-ChildItem $folders[$i] -filter "*$stake).zip"
New-Item -Name "Temp" -ItemType Directory
$output = #()
foreach ($log in $logs) {
Write-Host $log
& '7z' e $log -o"Temp" | Out-Null
Get-ChildItem "Temp" | Foreach-Object {
$output += Get-Content $_.FullName
Remove-Item $_
}
}
Remove-Item "Temp"
$output | Out-File "FullLog.txt"
This goes through each file, extracts it (ignores output of 7zip as it's informational only), reads the content of the extracted file then deletes it. Afterwards it cleans up and writes the total output to a file.