I won&#x27;t say I can&#x27;t live without them but here are a few I always do.  
These require a root shell.<p>Install Xcode command line tools<p><pre><code>  xcode-select --install
</code></pre>
verbose boot messages<p><pre><code>  nvram boot-args=&quot;-v&quot;
</code></pre>
make Library visible<p><pre><code>  chflags nohidden ~&#x2F;Library
</code></pre>
verify Time Machine backups<p><pre><code>  tmutil compare</code></pre>