LANGUAGE » RUBY

File

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Reference:docs.ruby-lang.org

Modes ​

Append can only write to the end of the file.

ModeCreateTruncateReadWriteInitial Pos
r✘✘✔✘Start
r+✘✘✔✔Start
w✔✔✘✔Start
w+✔✔✔✔Start
a✔✘✘▲End
a+✔✘✔▲End

Append b to mode for binary data.

Read file ​

Read everything in a single read:

rb
File.read('filename.txt')

Open a file for multiple reads (strip to remove trailing \n):

rb
File.open('filename.txt', 'r') do |file|
  file.readline.strip
  file.readline.strip
end

Write file ​

Write everything in a single write:

rb
File.write('file.txt', "Hello World\n")

Open a file for multiple writes:

rb
File.open('filename.txt', 'w') do |file|
  file.write("First line\n")
  file.write("Second line\n")
end