title: unix find and replace characters with strings for multiple characters
body: <p>I want to replace all occurrences of certain characters in my file with words. My question is, can I do that for all the characters using a single command. I am using the following command for replacing every occurrence of 'a' with 'apples'</p>
  
  <pre><code>sed 's/a/apple/g' sample.txt 
  </code></pre>
  
  <p>I don't want to write 3 or 4 similar commands to replace every occurrence of 'b', 'c', 'd' with some words. Is there any way out to extend the above command to suit my need or do I need to use the same three times ?</p>