<p></p>
<blockquote>
<p dir="auto">strace -f $( pgrep -g PID_OF_ANCESTOR | sed 's!^!-p !' )</p>
</blockquote>
<p dir="auto">This can be:</p>
<pre><code>strace -f -p "$( pgrep -g PID_OF_ANCESTOR)"
</code></pre>

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