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<p>Dear devs,</p>
<p>In the help file of r.mapcalc it is written:</p>
<p>
<blockquote type="cite">When the user enters input to <em>r.mapcalc</em>
non-interactively on
the command line, the program will not warn the user not to
overwrite
existing map layers. Users should therefore take care to assign
program
outputs raster map names that do not yet exist in their current
mapsets.
</blockquote>
</p>
<p>Perhaps the description is somewhat ambiguous, but if the way I
read this is correct, this is not the default behaviour. Perhaps
the following describes it better:<br>
</p>
<p>
<blockquote type="cite">By default it is not possible to overwrite
existing raster layers, so the user is expected to take care to
assign program output raster names that do not yet exist in
their current mapset. If they want to overwrite existing maps,
users can use the --overwrite flag.</blockquote>
<br>
</p>
I added a patch file in case the above is ok.<br>
<br>
Best wishes,<br>
<br>
Paulo<br>
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