How to use forfiles (or similar) to delete files older than n days, but always leaving most recent n

Posted by Aidan Whitehall on Stack Overflow See other posts from Stack Overflow or by Aidan Whitehall
Published on 2010-04-22T13:37:47Z Indexed on 2010/05/03 12:48 UTC
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(Using Windows 2000 and 2003 Server)

We use forfiles.exe to delete backup .zip files older than n days, and it works great (command is a bit like below)

forfiles -p"C:\Backup" -m"*.zip" -c"cmd /c if @ISDIR==FALSE del \"@PATH\@FILE\"" -d-5

If a .zip file fails to be created, I'd like to ensure that we don't end up with 0 .zip files in the backup after 5 days. Therefore, the command needs to be:

"delete anything older than 5 days, but ALWAYS keep the most recent 5 files, EVEN if they themselves are older than 5 days"

We can use forfiles.exe or another solution (although anything that is a slick one-liner is ALWAYS preferable to a script file).

Thanks!

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