Get the shifted/unshifted key for a standard US keyboard for each letter in a word

letter_shift.rb

def shift_case(word)
 lookup = {
  'z' => 'Z',
  'Z' => 'z',
  'x' => 'X',
  'X' => 'x',
  'c' => 'C',
  'C' => 'c',
  'v' => 'V',
  'V' => 'v',
  'b' => 'B',
  'B' => 'b',
  'n' => 'N',
  'N' => 'n',
  'm' => 'M',
  'M' => 'm',
  ',' => '<',
  '<' => ',',
  '.' => '>',
  '>' => '.',
  '/' => '?',
  '?' => '/',
  'a' => 'A',
  'A' => 'a',
  's' => 'S',
  'S' => 's',
  'd' => 'D',
  'D' => 'd',
  'f' => 'F',
  'F' => 'f',
  'g' => 'G',
  'G' => 'g',
  'h' => 'H',
  'H' => 'h',
  'j' => 'J',
  'J' => 'j',
  'k' => 'K',
  'K' => 'k',
  'l' => 'L',
  'L' => 'l',
  ';' => ':',
  ':' => ';',
  '\'' => '"',
  '"'  => '\'',
  'q' => 'Q',
  'Q' => 'q',
  'w' => 'W',
  'W' => 'w',
  'e' => 'E',
  'E' => 'e',
  'r' => 'R',
  'R' => 'r',
  't' => 'T',
  'T' => 't',
  'y' => 'Y',
  'Y' => 'y',
  'u' => 'U',
  'U' => 'u',
  'i' => 'I',
  'I' => 'i',
  'o' => 'O',
  'O' => 'o',
  'p' => 'P',
  'P' => 'p',
  '[' => '{',
  '{' => '[',
  ']' => '}',
  '}' => ']',
  '\\' => '|',
  '|' => '\\',
  '`' => '~',
  '~' => '`',
  '1' => '!',
  '!' => '1',
  '2' => '@',
  '@' => '2',
  '3' => '#',
  '#' => '3',
  '4' => '$',
  '$' => '4',
  '5' => '%',
  '%' => '5',
  '6' => '^',
  '^' => '6',
  '7' => '&',
  '&' => '7',
  '8' => '*',
  '*' => '8',
  '9' => '(',
  '(' => '9',
  '0' => ')',
  ')' => '0',
  '-' => '_',
  '_' => '-',
  '=' => '+',
  '+' => '=',
 }
  out = "" 
  word.split("").each do |letter|
   out += lookup[letter]
  end
  out
end

testword = "boobly123?><'|\\"
puts testword, "reversed", shift_case(testword)