00349pam a2200109 a 4500020002000000041000500020082001700025100002700042245008900069260005500158300002600213  a9788120305168c  h  a005.382bBAC  aBach M. J.,.eauthor.,  aThe Design of The  Unix Operating System:bUnix Operating System.hTextual Documents  aNew DelhibPHI Learning Pvt.  Ltd.,c1986 (c) 2012  a471:bxiv;c23*17 cm.