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=item B<-i> I<listfile>

Gives a file that lists the URLs to download and filenames to save
it: each line has a HTTP URL and a filename separated by whitespace.
The filename cannot contain whitespace.

    my($uri, $fnamej, $rest) = split " ", $spec;
    length($rest) and die "invalid spec (too many words, line $.): $sp
+ec";

    $spec=~s/\s+$//;
    my ($uri,$fnamej)=split /\s+/,$spec,2;