ruby output from file.

Question

I want to output data(integers) onto a file called stdout.txt. The trouble seems to be that my code overwrites the existing data in the file instead of adding to it line by line.

if failPlaces.empty? == false puts "position: #{failPlaces.last}" output = File.open( "stdout","w" ) output << "#{failPlaces.last}\n" output.close else puts "He Passes it!!!!!!!!!!!!!!!!!" output = File.open( "stdout","w" ) output << "Pass\n" output.close end

I would like to understand why my code is behaving like this and what the solution would be.

By the way, you can simplify the file output by passing a block to File.open: File.open( "stdout","w" ) { |output| output << "#{failPlaces.last}\n" }. Your file will be opened and closed for you automatically. — Keith Bennett
– Keith Bennett, Commented Jun 19, 2016 at 16:30

Nabeel · Accepted Answer · 2016-06-19 05:53:07Z

Given a file named stdout.txt you can write it as such (remember to use a rather than w). w will overwrite everything in the file whereas a will append if file exists, otherwise creates a new file.

Here is a list of Ruby IO modes

failPlaces = [1, 2] if failPlaces.empty? puts "He Passes it!!!!!!!!!!!!!!!!!" output = File.open('stdout.txt', 'a') output << "Pass\n" output.close else puts "position: #{failPlaces.last}" output = File.open('stdout.txt', 'a') output << "#{failPlaces.last}\n" output.close end

Thank you, I was using w(overwriting) whereas I should be using a(appending). Big help! thanks!

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