ruby file

code:_.rb

File.foreach("a.txt") do |line| # read

p line

end

File.open('b.txt','w') do |f| # write

f.puts('foo')

f.puts('hoo')

end

# 追記

file = File.open('path', 'a')

file.puts 'foo'

file.close

# 読み込み

p File.read('a.txt')

File.basename("/app/controller/foo.rb") # foo.rbだけ表示