title: Variable $1 as variable
body: <p>How can I set $1 variable as another variable? I want to run something like:</p>
  
  <pre><code>$ ./script london
  Some output with John in text
  </code></pre>
  
  <p>And the script should be like:</p>
  
  <pre><code>#!/bin/bash
  london="John"
  ukraina="Yury"
  romania="Ion"
  cat /path/to/file | grep $1
  </code></pre>