title: How to run C functions in shell?
body: <p>While learning C, I've recognized that you can see the manual of its functions within linux shell (I've been using BASH). For example:</p>
  
  <pre><code>man strlen
  man crypt
  man printf
  </code></pre>
  
  <p>I'd figured that maybe I could use those functions in shell scripting.</p>
  
  <p>Is this true?
  How can I use those functions in shell script?</p>