Change Ruby Path without RVM

Question

I'm not in the position to use RVM because I'm working with a predefined OS and a proxy.

I'm working on CentOS7 and my application uses ruby 2.3.1 . This comes pre-installed on this specific system. CentOS7 supports ruby up to 2.0.0 .

My problem is when I install KDE for a shell it installs ruby 2.0.0 and overrides certain paths so when I use ruby -v I now use 2.0.0 which is not good!

If I do which -a ruby I get

/usr/bin/ruby
/opt/rubies/ruby-2.3.1/bin/ruby

If I do echo $PATH I get

/opt/rh/rh-postgresql95/root/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/opt/rubies/ruby-2.3.1/bin:/usr/local/rvm/bin

The Ruby I want to use is installed in /opt/rubies/ruby-2.3.1/bin but /usr/bin comes before it. Is that the reason why CentOS7 is using that version of Ruby instead of the pre-installed Ruby 2.3.1 version in /opt/rubies/ruby-2.3.1/bin ?

If so, how do I change the order of the path?

Answer 1

The Ruby I want to use is installed in /opt/rubies/ruby-2.3.1/bin but /usr/bin comes before it. Is that the reason why CentOS7 is using that version of Ruby instead of the pre-installed Ruby 2.3.1 version in /opt/rubies/ruby-2.3.1/bin?

Yes, it is the reason.

how do I change the order of the path?

You can redefine the $PATH in your ~/.bashrc . Just add this line at the bottom:

export PATH="/opt/rubies/ruby-2.3.1/bin:$PATH"