.\" Copyright (c) 1990 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)learn.1 6.5 (Berkeley) 7/24/90
.Nd computer aided instruction about UNIX
gives Computer Aided Instruction courses and
practice in the use of UNIX, the C Shell,
and the Berkeley text editors.
To get started simply type
before and left your last session without completing a subject,
the program will use information in
in the same place you left off.
will ask questions to find out what you want to do.
Some questions may be bypassed by naming a
gave you in a previous session.
If you do not know the lesson number,
will look for the first lesson containing it.
this is useful for debugging.
There are a few special commands.
The command `bye' terminates a
session and `where' tells you of your progress,
with `where\0m' telling you more.
The command `again' re-displays the text of the lesson
to tell you the answers it expects in English, however,
the command `hint' prints the last part of the lesson script
used to evaluate a response, while `hint m' prints the
This is useful for debugging
lessons and might possibly give you an idea about what it expects.
Normally, lesson scripts are found in the directory /usr/lib/learn.
option allows one to specify a nonstandard place to look for scripts.
subtree for all dependent directories and files
B. W. Kernighan and M. E. Lesk,
.Em LEARN \- Computer-Aided Instruction on UNIX
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 first
Occasionally lessons are incorrect, sometimes because the local version
of a command operates in a non-standard way.
Occasionally a lesson script does not recognize all the different
correct responses, in which case the `hint' command may be useful.
Such lessons may be skipped with the `skip' command,
but it takes some sophistication to recognize the situation.
It is unclear whether this sort
of subject indexing is better than none.
Spawning a new shell is required for each of many
user and internal functions.
The `vi' lessons are provided separately from the others.
To use them see your system administrator.
appeared in Version 32 AT&T Unix.