[bug #33839] wget -nv outputs non-error output to stderr

Follow-up Comment #4, bug #33839 (group wget):

Diagnostic messages need to be sent to stderr, not stdout, otherwise this
would break "-O -". Then, there is a need for an option to suppress any
diagnostic message except error messages, e.g. for use with "cron".

No that using grep as suggested in 2022 is not a good workaround because one
cannot get the exit status of wget from a portable POSIX shell. (Also, there
might be false negatives.)


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