Follow-up Comment #9, bug #51181 (project wget):
"&" is a special shell character which causes a program to go to the
background. When you execute
wget https://example.com/dpp&key
it will actually be interpreted as:
wget https://example.com/dpp &
key
which will execute "wget https://example.com/foo"; to download that URL in the
background (due to "&"). After that it will execute the command "key" (which
it cannot find in your case).
To have the intended effect of downloading that particular URL, quote your URL
instead such that the special shell characters are not intepreted:
wget "https://example.com/dpp&key";
See also https://www.tldp.org/LDP/abs/html/quoting.html
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