これは私が実行しているコードです。15行目に到達するまでは問題なく動作します。実行するコマンドは次のとおりruby ex16.rb text.txt
です。これは私が書いている練習用のサンプルで、簡単な小さなテキストエディタを対象としています。
filename = ARGV.first
script = $0
puts "We're going to erase #{filename}."
puts "if you don't want that, hit CTRL-C (^C)."
puts "If you do want that, hit RETURN."
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()undefined method 'size'
puts "I'm going to write these to the file."
target.write(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")
puts "And finally, we close it."
target.close()