Read File

Ruby can read text from a file after another part of the program creates it.

read_file.rb

require "tmpdir"

line = 

Dir.mktmpdir do |dir|
  path = File.join(dir, "notes.txt")
  File.write(path, "#{line}\nsecond\n")

  content = File.read(path)
  rows = content.split("\n")

  puts "file=#{File.basename(path)}"
  puts "first=#{rows.first}"
  puts "line_count=#{rows.length}"
end

require "tmpdir"

line = 

Dir.mktmpdir do |dir|
  path = File.join(dir, "notes.txt")
  File.write(path, "#{line}\nsecond\n")

  content = File.read(path)
  rows = content.split("\n")

  puts "file=#{File.basename(path)}"
  puts "first=#{rows.first}"
  puts "line_count=#{rows.length}"
end

require "tmpdir"

line = 

Dir.mktmpdir do |dir|
  path = File.join(dir, "notes.txt")
  File.write(path, "#{line}\nsecond\n")

  content = File.read(path)
  rows = content.split("\n")

  puts "file=#{File.basename(path)}"
  puts "first=#{rows.first}"
  puts "line_count=#{rows.length}"
end

file read `File.read` loads the whole file content as a string.