open up <code>builtin.h</code>, find the
declaration for <code>cmd_pull</code>, and add a new line for <code>psuh</code> immediately before it,
in order to keep the declarations alphabetically sorted:</p>
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<div class="content">
<pre>int cmd_psuh(int argc, const char **argv, const char *prefix);</pre>
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<div class="paragraph">
<p>Be sure to <code>#include "builtin.h"</code> in your <code>psuh.c</code>.</p>
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<div class="paragraph">
<p>Go ahead and add some th