Unix recovery legend
Single most important habit I've developed as a SysAdmin:  measure twice, cut once.<p>I never just<p><pre><code>   sudo rm *</code></pre>
First, I do<p><pre><code>   echo sudo rm *</code></pre>
inspect the output, and then use CLI editing to recall the command, and delete the "echo"<p>I do this for damn near everything that involves a wildcard.  It's a lifesaver.