Installing ZeroMQ for Rubyists on Ubuntu

To install zmq gem in Ruby on Rails on Ubuntu, execute the command:

sudo apt-get install zeromq-bin libzmq-dbg libzmq-dev libzmq0

then

sudo gem install zmq

Getting error "Illegal octal digit"

While trying to execute below case method to display month, getting 'Illegal octal digit' for August and September month only:

def self.convert_month(month)
    case month
      when "Jan" :         01
      when "Feb" :        02
      when "Mar" :        03
      when "Apr" :        04
      when "May" :       05
      when "Jun" :         06
      when "Jul" :          07
      when "Aug" :       08
      when "Sep" :        09
      when "Oct" :        10
      when "Nov" :       11
      when "Dec" :        

  end

Solution

Ruby is interpreting numbers that have a leading 0 as being in octal (base 8). Thus the digits 8 and 9 are not valid. So,  I removed leading zero from Aug and Sep month and changed the method as:

when "Aug" :        8
when "Sep" :         9