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<section id="b4run-function">
<span id="b4run"></span><h1>b4run function<a class="headerlink" href="#b4run-function" title="Permalink to this heading">¶</a></h1>
<p>When using the Fortran code, the command:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">make</span> <span class="n">output</span>
</pre></div>
</div>
<p>invokes the <cite>runclaw</cite> function from
<a class="reference external" href="https://github.com/clawpack/clawutil/blob/master/src/python/clawutil/runclaw.py">$CLAW/clawutil/src/python/clawutil/runclaw.py</a>
to run the Fortran executable.</p>
<p>Starting in v5.7.1, this function has been modified to look for a Python <cite>b4run</cite>
function to be executed before running the Fortran code. This can be used,
for example, to:</p>
<blockquote>
<div><ul class="simple">
<li><p>automate copying certain files into the <cite>_output</cite> directory
(e.g. you might want to keep the <cite>Makefile</cite> and <cite>setrun.py</cite>
that were used for the run along with the output),</p></li>
<li><p>generate a log file with more information about the run, e.g.
what time the run was started and what directory the input files came
from (the <cite>rundir</cite>).</p></li>
</ul>
</div></blockquote>
<p>The file <a class="reference external" href="https://github.com/rjleveque/clawutil/blob/b4run/src/python/clawutil/b4run.py">$CLAW/clawutil/src/python/clawutil/b4run.py</a>
is a sample file showing the format it should have, and implements
the sample actions described above.</p>
<p>To search for a <cite>b4run.py</cite> file, the current <cite>rundir</cite> directory is
first checked and if there is no such file in this directory then
the environment variable <cite>B4RUN</cite> is checked, which can be set to
the full path of a <cite>b4run.py</cite> file that you wish to use globally, for example.</p>
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