you have to hate those stupid tools:

if you echo nlist |ftp some_url
the site *won't* give you an error code, it will just spew out a stupid line
like:
Failed to change directory.
Can't change directory to pub/OpenBSD/zoinx: No such file or directory

and that on stdout !!!

Detect this in list grabbing, and display a decent error message for the
user.

Avoids some duh moments where you won't find shit because you
mistyped the url...

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