wget to download files (most are zip files) automatically for me during the night.
However, sometimes in the morning I find that a few files cannot be unzipped. I don't know why this is happening, perhaps it's something wrong with the remote server.
I want to write a script to test zip files in my download folder periodically using 'unzip -t', but I don't want to test on the files that are being downloaded. So how can I tell if a file is being used by