Generate random password

def generate_passwd(length=16)
  chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ23456789'
  password = ''
  length.downto(1) { |i| password << chars[rand(chars.length - 1)] }
  password
end

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This Ruby function generates a random password with variable length.

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