BSD 4_3 development

Work on file usr/contrib/B/ex/try/README

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+Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1984.
+
+HOW'TO TRY the B editor:
+
+The directory B/ex/try is here to try the B editor interactively.  The
+example B workspace here can always be regenerated with:
+
+        cd  ../generate
+        cp  \'*  ../try
+        cd  ../try
+
+Now enter the B system from this directory with
+
+        ../../bin/b
+
+After the B system has started up it will prompt for a command with
+
+        >>> ?
+
+Slowly type `s', then `t', (no capitals needed) and you should see the B
+editor suggest the SELECT and START commands, respectively.  Now
+press [TAB] to accept this last suggestion, and [RETURN] to enter the
+START command to the B interpreter.  This command will promt you for
+input, with
+
+        ?
+
+Just enter about four lines of text, (which will be echoed), ending with an
+empty one (press [RETURN] immediately).  A short `poem' should be generated
+by the B interpreter.
+
+If you are already familiar with the B language, you might try to edit the
+START unit by answering
+
+        >>> ?
+
+with
+
+        :START
+
+For example, try to remove the SET'RANDOM command, to get random
+results on the same input.  Or make the unit delay the echoing of the text,
+entered by the user, until after the reading of the empty line.  For test-
+ing purposes you should at least try the arrow keys to move the focus
+around.
+
+You can undo any change by pressing [BACKSPACE].
+You can get help with ?.
+You can leave the B editor with control-X.
+You can leave `b' by typing QUIT.
+
+For more information, see the manual pages `B(1)' and `bterminal(5)', and
+the User's Guide.
+
+See the B Newsletter, issue 2, for a description of the `generate' program.
+
+If there are any problems with the editor, consult the `bterminal(5)'
+manual entry before trying anything else.