Getting Terminal size by ruby

terminal_size.rb

# Here are many ways to get terminal size from ruby

# By Readline
require 'readline'
Readline.get_screen_size   #=> [31, 268]


# Get terminal size in Environemtn like IRB
[ENV['COLUMNS'].to_i, ENV['LINES'].to_i]

# or

# Get terminal size by line command line "stty"
`stty size`.scan(/\d+/).map { |s| s.to_i }.reverse

# or 

 # Get the current width of the terminal
 #
 # @return [Integer] number of columns
  def terminal_width
    guess = `tput cols`.to_i
    guess == 0 ? 80 : guess
  end

  # Get the current height of the terminal
  #
  # @return [Integer] number of lines
  def terminal_height
    guess = `tput lines`.to_i
    guess == 0 ? 25 : guess
  end

ruby -rreline -e 'p Reline.get_screen_size'