Extra credit for ex16. Must remember the 1.8 incompatibility thing.

ex16-ec.rb

@@ -0,0 +1,30 @@
+filename = ARGV.first
+script = $0
+
+puts <<EOF
+We're going to erase #{filename}.
+If you don't want that, hit CTRL-C (^C).
+If you do want that, hit RETURN.
+EOF
+
+print "? "
+STDIN.gets
+
+puts "Opening the file..."
+target = File.open(filename, 'w')
+
+puts "Truncating the file.  Goodbye!"
+target.truncate(target.size)
+
+puts "Now I'm going to ask you for three lines"
+
+print "line 1: "; line1 = STDIN.gets.chomp
+print "line 2: "; line2 = STDIN.gets.chomp
+print "line 3: "; line3 = STDIN.gets.chomp
+
+puts "I'm going to write these to the file."
+
+target.write("#{line1}\n#{line2}\n#{line3}\n")
+
+puts "And finally, we close it."
+target.close