openbsd-webzine/issues/issue-3/50_TIPS.html

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<article id="tips">
<div class="puffies" aria-hidden="true">🐡🐡🐡</div>
<h2>Shell tip</h2>
<p>
Display the current month calendar with current day highlighted:
<pre>now=$(date +%d) ; /usr/bin/cal -m | \
sed -E "3,\\$s/( |^)($now)( |\\$)/\\1$(printf "\\033[7m")\\2$(printf "\\033[0m")\\3/"</pre>
</pre>
</p>
</article>