1Note that play directories are created in /tmp, no longer 2in /usr/lib/learn/play. The C script is not complete; 3use at your own risk. The editor script still smacks of ed. 4 5Lessons are in 6 /usr/lib/learn/* 7and auxilliary programs are in 8 /usr/lib/learn/bin 9 10Make a learn by 11 make 12Check that it's sensible with 13 make check 14If that doesn't print any messages, 15you're probably in good shape. 16 17Lesson directories may be protected. 18 19Learn collects a log file for each script in the .../learn/log 20directory, with a file for each script (files, editor, etc.) 21containing an entry for each lesson attempted. 22These files will grow without bound, 23unless they are periodically truncated. 24The log files should have general write permission. 25If you don't want logging (a sensible position to take), 26set the variable "logging" to zero in source/learn.c 27before making learn, remove the log directory, or just 28turn off write permission for a particular log file. 29 30Learn requires about 1500 blocks to make itself, 31and about 1000 when completely made. 32 33The best way to get ex to prompt within learn was to modify 34the user's environment variables PATH and EXINIT. 35 36Due to inane assumptions in the VAX versions of csh -i and ex 37when stdin and stdout are not terminals, kludges have been 38added with #if's. In particular, I use the old terminal driver 39to keep #copyout working and make sh -i masquerades as 40a csh -i (by setting PS1=% ) to keep #pipe working. 41 42"#create" can now end in an incomplete last line with ....#\n 43On input the string %s is converted to the lesson directory. 44On output with "#copyout", prompt signs ("% ") are removed. 45"#cmp" now takes a trailing number specifying that only that 46many lines are to be compared. 47 48The new command "xyzzy" prints the answer (i.e. the last part 49of the lesson), and "xyzzy x" prints the whole lesson text. 50A new routine called getlesson tries to construct a valid 51lesson number from in invalid one before giving up. 52The commands "where", "skip", and "again" are also new. 53Greeting, closing, and reminder messages have been expanded. 54 55Please report problems, bad lessons, contributions, etc., to 56John Kunze, UC Berkeley, 415-642-1530, ucbvax!ucbernie.jak . 57Thanks. 58