The subject \|'s presently handled are
files editor vi morefiles macros eqn C
There are a few special commands. The command `bye' terminates a learn session and `where' tells you of your progress, with `where\0m' telling you more. The command `again' re-displays the text of the lesson and `again\0lesson' lets you review lesson . There is no way for learn 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 whole lesson script. 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. The - directory option allows one to specify a nonstandard place to look for scripts.
/usr/tmp/pl\(** playpen directories
$HOME/.learnrc startup information
B. W. Kernighan and M. E. Lesk, LEARN - Computer-Aided Instruction on UNIX
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.
To find a lesson given as a word, learn does a simple fgrep (1) through the lessons. 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.