date and time created 86/05/23 09:24:40 by kjd

SCCS-vsn: usr.bin/learn/USD.doc/p0 6.1

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+.\"    @(#)p0  6.1 (Berkeley) %G%
+.\"
+.EH 'USD:2-%''LEARN \(em Computer-Aided Instruction on UNIX'
+.OH 'LEARN \(em Computer-Aided Instruction on UNIX''USD:2-%'
+.\".RP
+....TM "79-1274-xx 79-1273-yy" 39199 39199-11
+....ND June 18, 1976
+....TM "76-1274-6 76-1273-5" 39199 39199-11
+.TL
+LEARN \(em Computer-Aided Instruction on UNIX
+.br
+(Second Edition)
+.AU "MH 2C-518" 6021
+Brian W. Kernighan
+.AU "MH 2C-569" 6377
+Michael E. Lesk
+.AI
+.MH
+.AB
+.PP
+This paper describes the
+second version of the
+.I
+learn
+.R
+program for interpreting CAI
+scripts on
+the
+.UX 
+operating system,
+and a set of scripts that provide a computerized introduction
+to the system.
+.PP
+Six current scripts cover basic commands and file
+handling, the editor, additional file handling commands, the
+.I
+eqn
+.R
+program for mathematical
+typing,
+the ``\-ms'' package of formatting macros,
+and an introduction to the C programming language.
+These scripts now include a total of
+about 530 lessons.
+.PP
+Many users from a wide variety of backgrounds have used
+.I learn
+to acquire basic UNIX skills.
+Most usage involves the first two scripts,
+an introduction to
+.UX
+files and commands, and
+the
+.UX
+editor.
+.PP
+The second version of
+.I learn
+is about four times faster than the previous one
+in CPU utilization,
+and much faster in perceived time
+because of better overlap of computing and printing.
+It also requires less file space than the first version.
+Many of the lessons have been revised;
+new material has been added to reflect changes
+and enhancements in 
+.UX
+itself.
+Script-writing is also easier
+because of revisions to the script language.
+.AE
+.CS 11 2 13 4 0 0