import BTL learn(1) lessons/editor

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+#print
+Perhaps the most powerful command in the editor is the 'g' 
+(global) command.   This always precedes a second command
+on the same command line; it selects those file lines
+on which the second command is to be executed.
+For example
+  g/abc/s/def/ghi/p
+says: "Find all lines in the file which
+contain the string "abc"; change the first
+"def" on any such line into "ghi".  The command
+after the 'g' may be any command, of course.
+Needless to say, the expressions after the 'g' may
+include all the special characters.
+Edit the file "towns" so that each line beginning
+with "-" has " (county seat)" added at its end.
+Rewrite the file and type "ready".
+#create Ref
+-newark (county seat)
+  east orange
+  south orange
+  maplewood
+-elizabeth (county seat)
+  linden
+  cranford
+  westfield
+-morristown (county seat)
+  madison
+  chatham
+  dover
+#create towns
+-newark
+  east orange
+  south orange
+  maplewood
+-elizabeth
+  linden
+  cranford
+  westfield
+-morristown
+  madison
+  chatham
+  dover
+#user
+#cmp towns Ref
+#log
+#next
+71.1a 10
+70.2e 9
+70.2d 6