Brian W.Kernighan,Rob Pike <br/><br/>
The UNIX Programming Environment 

 - 
 -  Prentice-Hall  1988 
 - 357 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-87692-499-2 
<br/><br/><label>Dewey Class. No.: </label>004.451