.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.TLLEARN \(em Computer-Aided Instruction on UNIX.br(Second Edition).AU "MH 2C-518" 6021Brian W. Kernighan.AU "MH 2C-569" 6377Michael E. Lesk.AI.MH.OKCAI.AB.PPThis paper describes thesecond version of the.Ilearn.Rprogram for interpreting CAIscripts onthe.UX operating system,and a set of scripts that provide a computerized introductionto the system..PPSix current scripts cover basic commands and filehandling, the editor, additional file handling commands, the.Ieqn.Rprogram for mathematicaltyping,the ``\-ms'' package of formatting macros,and an introduction to the C programming language.These scripts now include a total ofabout 530 lessons..PPMany users from a wide variety of backgrounds have used.I learnto acquire basic UNIX skills.Most usage involves the first two scripts,an introduction to.UXfiles and commands, andthe.UXeditor..PPThe second version of.I learnis about four times faster than the previous onein CPU utilization,and much faster in perceived timebecause 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 changesand enhancements in .UXitself.Script-writing is also easierbecause of revisions to the script language..AE.CS 11 2 13 4 0 0