title: What is the significance of . $1 in the below script
body: <p>Could you please help me to understand the significance of <code>. $1</code> in the script below.</p>
  
  <pre><code># source the config file after checking for a valid file
  if [ -f $1 ]
  then
      echo "File path " $1
  else
      echo "Not a valid filename"
      exit 1
  fi
  curr_dir=$( cd "$( dirname "$0" )" &amp;&amp; pwd )
  country='AU'
  
  . $1
  echo "========Printing config properties====="
  cat $1
  </code></pre>