$list = {
    100=>'arqc100',
    101=>'arqc101',
    102=>'arqc102',
    103=>'arqc103',
    104=>'arqc104',
    105=>'arqc105',
    106=>'arqc106',
    107=>'arqc107',
    108=>'arqc108',
    109=>'arqc109'
}

def show
    $list.each { |key,filename| puts "[#{key}] - #{filename}" }
end

show
puts 'Excluir qual arquivo?'
escolhido = gets.chomp

$list.each { |key,value|
    if key.==escolhido
        rmv = "files/rn_#{value}.txt"
        puts
        File::delete(rmv)
    else
        puts 'Não deu certo!'
    end
}