I have a list of filenames in a text file like this:
f1.txt
f2
f3.jpg
How do I delete everything else from a folder except these files in Powershell?
Pseudo-code:
Data:
-- begin exclusions.txt --
a.txt
b.txt
c.txt
-- end --
Code:
# read all exclusions into a string array
$exclusions = Get-Content .\exclusions.txt
dir -rec *.* | Where-Object {
$exclusions -notcontains $_.name } | `
Remove-Item -WhatIf
Remove the -WhatIf switch if you are happy with your results. -WhatIf shows you what it would do (i.e. it will not delete)
-Oisin
dir -rec *.* are FileInfo instances, you can just use $_.Name to get the file name. PowerShell converts the file to a string in order to call [io.path]::GetFileName($_).If the files exist in the current folder then you can do this:
Get-ChildItem -exclude (gc exclusions.txt) | Remove-Item -whatif
This approach assumes each file is on a separate line. If the files exist in subfolders then I would go with Oisin's approach.
actually this only seems to work for the first directory rather than recursing - my altered script recurses properly.
$exclusions = Get-Content .\exclusions.txt
dir -rec | where-object {-not($exclusions -contains [io.path]::GetFileName($_))} | `
where-object {-not($_ -is [system.IO.directoryInfo])} | remove-item -whatif
