.\" SCCSID: @(#)learn.1	8.1	9/11/90.TH learn 1 "" "" Unsupported.SH Namelearn \- computer aided instruction about UNIX.SH Syntax.B learn[.BI \- directory][ \fIsubject\fP [ \fIlesson\fP ] ].SH DescriptionThe.PN learncommand gives computer aided instruction courses andpractice in the use of UNIX, the C Shell,and the Berkeley text editors.To get started simply type.BR learn .The program will ask questions to find out whatyou want to do.Some questions may be bypassed by naming a.IR subject ,and more yet by naming a.IR lesson .You may enter the.I lessonas a number that.PN learngave you in a previous session.If you do not know the lesson number,you may enter the.I lessonas a word, and.PN learnwill look for the first lesson containing it.If the.I lessonis `\fB\-\fP',.PN learnprompts for each lesson;this is useful for debugging..PPThe.IR subject spresently handled are.if n .sp 1v.if t .sp .5v.nf           files           editor           vi           morefiles           macros           eqn           C.fi.PPThere are a few special commands.The command `bye' terminates a .PN learnsession and `where' tells you of your progress,with `where\0m' telling you more.The command `again' re-displays the text of the lessonand `again\0\fIlesson\fP' lets you review.IR lesson ..SH Options.TP 15.BI \- directoryAllows one to exercise a script ina nonstandard place..SH RestrictionsThe main strength of.PN learn,that it asks the student to use the real UNIX,also makes possible baffling mistakes.It is helpful, especially for nonprogrammers,to have a UNIX initiate near at hand during the firstsessions..PPOccasionally lessons are incorrect, sometimes because the local versionof a command operates in a non-standard way.Such lessons may be skipped with the `skip' command,but it takes some sophistication to recognizethe situation..PPTo find a.I lessongiven as a word,.PN learndoes a simple.MS fgrep 1 through the lessons.It is unclear whether this sortof subject indexing is better than none..PPSpawning a new shell is required for each of manyuser and internal functions..SH Files.nf/usr/lib/learn	subtree for all dependent directories and files/usr/tmp/pl\(**	playpen directories.SH See Alsocsh(1), ex(1)