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check download file
If I get a link for dropbox and I use the 'wget' to download it.
How to check it if download successfully?
alicera In addition to the method Здравко helpfully provided, you could use the /2/sharing/get_shared_link_metadata Dropbox API endpoint to retrieve the metadata for a shared link, or an error if the shared link is invalid.
https://unix.stackexchange.com/questions/474805/verify-if-a-url-exists
I use the method and give error dropbox link,
it is return link exist
Ahh... alicera, now I see what you mean.
You want to check not for error in transfer process or error because of existing (already) file, but link validity.
It's not so trivial cosa Dropbox links are dynamically generated and even when no real file exists link point to error message (as a content, it's still valid). That's why you are getting "200 OK" for both valid and invalid link (the error message is valid 🤫). But there is a workaround. 😉 When some link is invalid, error message gets back immediately. If your link points to real file, redirect is performed to the pointed file. You can exploit this. 'wget' perform redirects by default and that's why always succeeds. If you disable redirects, a "strange" situation will happen: valid links will result in error (can't redirect), but invalid will succeed (redirect doesn't needed). So, inverting the check logic is going let you distinguish valid to invalid links. 🙂 Use something like following template:
wget --method=HEAD -q --max-redirect 0 <some Dropbox shared link>
echo $?The above just print resulting code (currently 0 for invalid link - inverted logic). You can check it in conditional expression too, of course.
Hope this helps.
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