[Bug 53506] output is duplicated when using redirector inside exec

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=53506

--- Comment #3 from Kostas Filios <konfil...@gmail.com> ---
I just reproduced this issue using 1.9.6

It turns out there's a workaround. Here's what produces duplicate output:

<exec>
    <redirector output="logfile"
                alwayslog="true"
                append="true" />
</exec>


Here's what doesn't (I've added the error="" to point to the exact same file):

<exec>
    <redirector output="logfile"
                error="logfile"
                alwayslog="true"
                append="true" />
</exec>


Instead of adding error="" you can also add errorproperty="". Generally, just
make sure you don't only provide output="", as it will produce duplicate output
to the console when combined with alwayslog="true".

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