Difference between $stdout and STDOUT in Ruby

$stdout is a global variable that represents the current standard output. STDOUT is a constant representing standard output and is typically the default value of $stdout.

With STDOUT being a constant, you shouldn’t re-define it, however, you can re-define $stdout without errors/warnings (re-defining STDOUT will raise a warning). for example, you can do:

$stdout = STDERR

Same goes for $stderr and STDERR

So, to answer the other part of your question, use the global variables to redirect output, not the constants. Just be careful to change it back further on in your code, re-defining global variables can impact other parts of your application.

Related Posts:

  1. Confused about stdin, stdout and stderr?
  2. Get underlined text with Markdown
  3. What is the meaning of *nix?
  4. Get underlined text with Markdown
  5. What does the “map” method do in Ruby?
  6. How to write a switch statement in Ruby
  7. Rails 5 ActionController::InvalidAuthenticityToken error
  8. what does ? ? mean in ruby
  9. How to update Ruby Version 2.0.0 to the latest version in Mac OSX Yosemite?
  10. What does %w(array) mean?
  11. How to use “gets” and “gets.chomp” in Ruby
  12. Getting a substring in Ruby by x number of chars
  13. How to check whether a string contains a substring in Ruby
  14. Ruby: How to install a specific version of a ruby gem?
  15. ruby operator “=~” [duplicate]
  16. What is attr_accessor in Ruby?
  17. ActionController::UnknownFormat
  18. What does ||= (or-equals) mean in Ruby?
  19. How to read lines of a file in Ruby
  20. Array to Hash Ruby
  21. Ruby: undefined method `[]’ for nil:NilClass when trying to get Enumerator on an Array of Hashes
  22. How to map with index in Ruby?
  23. Ruby equivalent for Python’s “try”?
  24. What does “+=” (plus equals) mean?
  25. Rails 4 RoutingError: No Route Matches
  26. How to sum array of numbers in Ruby?
  27. Ruby array to string conversion
  28. How to check if a value exists in an array in Ruby
  29. undefined method (NoMethodError) ruby
  30. Multi-Line Comments in Ruby?
  31. How to uninstall ruby installed by ruby-install
  32. PG::ConnectionBad – could not connect to server: Connection refused
  33. Rails syntax error : unexpected keyword_ensure, expecting end-of-input
  34. Removing all installed Gems and starting over
  35. Ruby `send` vs `call` method
  36. What is the meaning of “do | |” in Ruby?
  37. RVM is not a function, selecting rubies with ‘rvm use …’ will not work
  38. How to delete specific characters from a string in Ruby?
  39. Ruby: kind_of? vs. instance_of? vs. is_a?
  40. Rails: I installed Ruby, now “bundle install” doesn’t work
  41. How to do a newline in output
  42. Ruby: What is the easiest way to remove the first element from an array?
  43. Ruby String to Date Conversion
  44. p vs puts in Ruby
  45. Determining type of an object in ruby
  46. Fizz Buzz in Ruby for dummies
  47. How to Uninstall RVM? [duplicate]
  48. What is the “right” way to iterate through an array in Ruby?
  49. What is the difference between a Process’ pid, ppid, uid, euid, gid and egid?
  50. Equivalent of “continue” in Ruby
  51. What does the Ruby method ‘to_sym’ do?
  52. Difference between map and collect in Ruby?
  53. Creating and iterating a 2d array in Ruby
  54. What is the best way to convert an array to a hash in Ruby
  55. Ruby 2.0.0p0 IRB warning: “DL is deprecated, please use Fiddle”
  56. Getting error: dyld: Symbol not found: _clock_gettime
  57. Uninstall old versions of Ruby gems
  58. Uploading a file in Rails
  59. What is java interface equivalent in Ruby?
  60. Sort hash by key, return hash in Ruby
  61. Gem installation error: You have to install development tools first
  62. How to understand strptime vs. strftime
  63. How can I delete one element from an array by value
  64. How to break out from a ruby block?
  65. ERROR: While executing gem … (Gem::FilePermissionError)
  66. No such file or directory @ rb_sysopen ruby
  67. How to add to an existing hash in Ruby
  68. Ruby ‘require’ error: cannot load such file
  69. How to convert a string to lower or upper case in Ruby
  70. What is the canonical way to trim a string in Ruby without creating a new string?
  71. No implicit conversion of String into Integer (TypeError)?
  72. Multi-Line Comments in Ruby?
  73. How to see stdout of ansible commands?
  74. Why does Ruby on Rails use http://0.0.0.0:3000 instead of http://localhost:3000?
  75. Parsing a JSON string in Ruby
  76. Tell Ruby Program to Wait some amount of time
  77. multiple prints on the same line in Python
  78. How I can print to stderr in C?
  79. The difference between stdout and STDOUT_FILENO
  80. class << self idiom in Ruby
  81. Parsing XML with Ruby
  82. What does << mean in Ruby?
  83. Unable to install gem – Failed to build gem native extension – cannot load such file — mkmf (LoadError)
  84. Cannot load such file — bcrypt_ext
  85. How do I remove Permission denied @ rb_sysopen – Gem install error?
  86. Difference between “or” and || in Ruby?
  87. warning: constant ::Fixnum is deprecated When generating new model
  88. How to open every file in a folder
  89. bcrypt LoadError: Cannot load such file
  90. Uninitialized constant “Controller Name”
  91. What does @@variable mean in Ruby?
  92. Difference between rake db:migrate db:reset and db:schema:load
  93. TypeError: no implicit conversion of Symbol into Integer
  94. An unhandled lowlevel error occurred. The application logs may have details
  95. Array to Hash Ruby
  96. Purge or recreate a Ruby on Rails database
  97. How to run Ruby code from terminal?
  98. Migrations are pending; run ‘bin/rake db:migrate RAILS_ENV=development’ to resolve this issue
  99. write() to stdout and printf output not interleaved?
  100. bash: print stderr in red color

Leave a Comment

deneme bonusu veren sitelerbahis casinomakrobetceltabetpinbahispolobetpolobet girişpinbahis girişmakrobet girişpulibet girişmobilbahis girişkolaybet giriş