title: Meaning of "$PWD":/path/to/directory"
body: <p>In docker I run the <code>docker run</code> with the following parameter: <code>-v &quot;$PWD&quot;:/usr/src/app</code>. I know that <code>-v</code> specify where to mount the volume and <code>pwd</code> returns my current path. However, what does the <code>&quot;$PWD:&quot;</code> mean?</p>