title: Writing shell script on Minix
body: <p>I'm totally new in writing shell scripts so I could use some help here.</p>
  
  <p>I would like to write a script that when run with no parameters it just echo backs, and when it is given a data (.dat) file it displays the content of it.</p>
  
  <p>Excuse me for my bad English,
  R.</p>