Rails - Oct 2013 - Confusion over installed versions

Hi

I have got confused by ruby/gems etc as i seem to have some kind of path 
issues somehow. First issue is i seem to have 3 flavours of ruby installed 
...

# ruby -v
ruby 1.9.3p374 (2013-01-15) [i686-linux]

# /opt/ruby-enterprise-1.8.7-2012.01/bin/ruby -v
ruby 1.8.7 (2011-12-28 MBARI 8/0x8770 on patchlevel 357) [i686-linux], 
MBARI 0x8770, Ruby Enterprise Edition 2012.01

# /opt/ruby/bin/ruby -v
ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-linux]

# grep ruby /etc/httpd/conf/httpd.conf
LoadModule passenger_module 
/opt/ruby/lib/ruby/gems/1.8/gems/passenger-3.0.11/ext/apache2/mod_passenger.so
PassengerRoot /opt/ruby/lib/ruby/gems/1.8/gems/passenger-3.0.11
PassengerRuby /opt/ruby/bin/ruby


So i guess i am using /opt/ruby/bin/ruby for live web site?

So then when i try to do anything with the gem command it is not happy...

# gem -v
/usr/bin/ruby: No such file or directory --  ''--prefix=/usr''
(LoadError)

# /opt/ruby-enterprise-1.8.7-2012.01/bin/gem -v
1.8.15

/opt/ruby/bin/gem -v
/usr/bin/ruby: No such file or directory --  ''--prefix=/usr''
(LoadError)


Im assuming that i need to be using "gem -v" which in turn is the same
as
"/opt/ruby/bin/gem -v"? But neither works.

Any idea how to set a path or some such so i can use the gem commands? I 
have Googled a bit but havent found a good (understandable!) answer. Also 
how do i uninstall the unused ruby versions?

Thanks in advance. 

John

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On 2 October 2013 15:36, John Bayes
<logica111-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
wrote:
> Hi
>
> I have got confused by ruby/gems etc as i seem to have some kind of path
> issues somehow. First issue is i seem to have 3 flavours of ruby installed
Use rvm (or rbenv, but I have not personal experience of that) to
manage ruby and gems.

Colin

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