What are the Ruby File.open modes and options?

by

In Ruby IO module documentation, I suppose.

Mode |  Meaning
-----+--------------------------------------------------------
"r"  |  Read-only, starts at beginning of file  (default mode).
-----+--------------------------------------------------------
"r+" |  Read-write, starts at beginning of file.
-----+--------------------------------------------------------
"w"  |  Write-only, truncates existing file
     |  to zero length or creates a new file for writing.
-----+--------------------------------------------------------
"w+" |  Read-write, truncates existing file to zero length
     |  or creates a new file for reading and writing.
-----+--------------------------------------------------------
"a"  |  Write-only, starts at end of file if file exists,
     |  otherwise creates a new file for writing.
-----+--------------------------------------------------------
"a+" |  Read-write, starts at end of file if file exists,
     |  otherwise creates a new file for reading and
     |  writing.
-----+--------------------------------------------------------
"b"  |  Binary file mode (may appear with
     |  any of the key letters listed above).
     |  Suppresses EOL <-> CRLF conversion on Windows. And
     |  sets external encoding to ASCII-8BIT unless explicitly
     |  specified.
-----+--------------------------------------------------------
"t"  |  Text file mode (may appear with
     |  any of the key letters listed above except "b").

More Related Contents:

  1. How to search file text for a pattern and replace it with a given value
  2. How to write to file in Ruby?
  3. What are all the common ways to read a file in Ruby?
  4. How to search a folder and all of its subfolders for files of a certain type
  5. Reading the last n lines of a file in Ruby?
  6. Read binary file as string in Ruby
  7. Ruby: String Comparison Issues
  8. Ruby 2.0.0p0 IRB warning: “DL is deprecated, please use Fiddle”
  9. Why is `a = a` `nil` in Ruby?
  10. Ruby ampersand colon shortcut [duplicate]
  11. How does object_id assignment work?
  12. naked asterisk as parameter in method definition: def f(*)
  13. Difference between ‘..’ (double-dot) and ‘…’ (triple-dot) in range generation?
  14. When should I use Struct vs. OpenStruct?
  15. How to upgrade rubygems
  16. How do I generate a list of n unique random numbers in Ruby?
  17. obj.nil? vs. obj == nil
  18. Find key/value pairs deep inside a hash containing an arbitrary number of nested hashes and arrays
  19. Learning Insertion Sort in Ruby
  20. Can’t install RMagick 2.13.1. Can’t find MagickWand.h.
  21. gem eventmachine fatal error: ‘openssl/ssl.h’ file not found
  22. Is there an inverse ‘member?’ method in ruby?
  23. Passing a method as a parameter in Ruby
  24. In Ruby, is there an Array method that combines ‘select’ and ‘map’?
  25. What does “
  26. How to check if a directory/file/symlink exists with one command in Ruby
  27. Split string by multiple delimiters
  28. RVM and thin, root vs. local user
  29. Ruby array subtraction without removing items more than once
  30. How do I remove blank elements from an array?

Leave a Comment