Open a file in a mode where it can be read from and written to at the same time


f = File.open("text.txt", "r+")
puts f.gets
f.puts "This is a test"
puts f.gets
f.close

1.	The Different Modes of Opening a File
2.	opens up your text.txt file:
3.	The second parameter "r" defines that you're opening the file for reading.
4.	open file block
5.	Read UTF-8 text
6.	Write UTF-8 text
7.	Latin-1 transcoded to UTF-8 in File.open
8.	Open a file for reading binary data

Open a file in a mode where it can be read from and written to at the same time : Open a File « File Directory « Ruby