UNIX and shell programming/  a textboook 
Forouzan,Behrouz A. 
 - 1st 
 - Australia:  Cengage Learning,  2009. 
 - 875 
<br/><br/><label>ISBN: </label>9788131503256 
<br/><br/><label>Dewey Class. No.: </label>005.13  / FOR/U