.tl '--''--' .ps20 .sp 4.25i .ft B .ce UNIX PROGRAMMER'S MANUAL .ps10 .sp |5i .ft I .ce 4.2 Berkeley Software Distribution .ce Virtual VAX\-11 Version .sp |5.75i .ce August, 1983 .sp |9.2i .ft R .ce Computer Science Division .ce Department of Electrical Engineering and Computer Science .ce University of California .ce Berkeley, California 94720