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tiny tip

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issues/issue-4/50_TIPS.html
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<div class="puffies" aria-hidden="true">🐡🐡🐡</div>
<h2>Shell tips</h2>
<p>
Enter "<code>r</code>" in a ksh shell to repeat the last command.It is actually an alias to "<code>fc -s</code>".
</p>
</article>