From: Joel VanderWerf <joelvanderwerf@...>
Date: 2010-02-21T03:38:27+09:00
Subject: Re: Specifying Ruby Version from Command Line

Alex DeCaria wrote:
> I have two versions of Ruby installed (1.8 and 1.9).  When starting a
> Ruby script from the command window, how do I specify which version of
> Ruby I want to use?   I'm assuming there is some option for this that I
> can set, but I don't know what it is.

One way is to build with the --program-suffix option:

$ ./configure --help | grep suffix
   --program-suffix=SUFFIX            append SUFFIX to installed program 
names

I usually build 1.8 normally, and build 1.9 with

   --program-suffix=19

Remember to use gem19 to install gems for 1.9.