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1.1       root        1: .\"    @(#)p0  6.1 (Berkeley) 5/23/86
                      2: .\"
                      3: .EH 'USD:2-%''LEARN \(em Computer-Aided Instruction on UNIX'
                      4: .OH 'LEARN \(em Computer-Aided Instruction on UNIX''USD:2-%'
                      5: .\".RP
                      6: ....TM "79-1274-xx 79-1273-yy" 39199 39199-11
                      7: ....ND June 18, 1976
                      8: ....TM "76-1274-6 76-1273-5" 39199 39199-11
                      9: .TL
                     10: LEARN \(em Computer-Aided Instruction on UNIX
                     11: .br
                     12: (Second Edition)
                     13: .AU "MH 2C-518" 6021
                     14: Brian W. Kernighan
                     15: .AU "MH 2C-569" 6377
                     16: Michael E. Lesk
                     17: .AI
                     18: .MH
                     19: .AB
                     20: .PP
                     21: This paper describes the
                     22: second version of the
                     23: .I
                     24: learn
                     25: .R
                     26: program for interpreting CAI
                     27: scripts on
                     28: the
                     29: .UX 
                     30: operating system,
                     31: and a set of scripts that provide a computerized introduction
                     32: to the system.
                     33: .PP
                     34: Six current scripts cover basic commands and file
                     35: handling, the editor, additional file handling commands, the
                     36: .I
                     37: eqn
                     38: .R
                     39: program for mathematical
                     40: typing,
                     41: the ``\-ms'' package of formatting macros,
                     42: and an introduction to the C programming language.
                     43: These scripts now include a total of
                     44: about 530 lessons.
                     45: .PP
                     46: Many users from a wide variety of backgrounds have used
                     47: .I learn
                     48: to acquire basic UNIX skills.
                     49: Most usage involves the first two scripts,
                     50: an introduction to
                     51: .UX
                     52: files and commands, and
                     53: the
                     54: .UX
                     55: editor.
                     56: .PP
                     57: The second version of
                     58: .I learn
                     59: is about four times faster than the previous one
                     60: in CPU utilization,
                     61: and much faster in perceived time
                     62: because of better overlap of computing and printing.
                     63: It also requires less file space than the first version.
                     64: Many of the lessons have been revised;
                     65: new material has been added to reflect changes
                     66: and enhancements in 
                     67: .UX
                     68: itself.
                     69: Script-writing is also easier
                     70: because of revisions to the script language.
                     71: .AE
                     72: .CS 11 2 13 4 0 0

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