Link ruby to RVM | 易学教程

问题

I tried looking for an answer for about an hour but no luck. I have installed ruby-2.0.0 with my rvm but the system only detects the old ruby-1.9.3 !I changed the sym link in /usr/bin/ruby to point to my ~/.rvm ruby and now I get the following when I run ruby -v

ruby 2.0.0p451 (2014-02-24 revision 45167) [x86_64-linux]

However when I try to start a rails server I get the error which says my current ruby version is 1.9.3 I ran gem env and got a surprising results:

RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.23
  - RUBY VERSION: 1.9.3 (2012-04-20 patchlevel 194) [x86_64-linux]
  - INSTALLATION DIRECTORY: /var/lib/gems/1.9.1
  - RUBY EXECUTABLE: /usr/bin/ruby1.9.1
  - EXECUTABLE DIRECTORY: /usr/local/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /var/lib/gems/1.9.1
     - /home/username/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "install" => "--no-rdoc --no-ri"
     - "update" => "--no-rdoc --no-ri"
  - REMOTE SOURCES:
     - http://rubygems.org/

As you can see it is pointing to the wrong location. I tried modifying .gemrc to get it to work but it still refuses to change it's ruby installation directory. I have no idea how to fix it. I tried removing them all and starting fresh but apparently they are not installed via apt-get so I don't know how to remove them!

Any help will be very much appreciated. Just for further info:

$ gem -v                                                    
1.8.23

回答1:

First list ruby versions in RVM

rvm list

For example mine says

   ruby-1.9.3-p484 [ x86_64 ]
=* ruby-2.1.0 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

To use a ruby version use command like

rvm use ruby-2.1.0

You can set default ruby like this

rvm use --default ruby-2.1.0

Now check your ruby version

ruby -v

To ensure that non-interactive shells have access to RVM

Edit .bashrc using this command

sudo gedit /home/$USER/.bashrc

Make sure you have these lines there. If not add it.

PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting
[[ -s "/home/`whoami`/.rvm/scripts/rvm" ]] && source "/home/`whoami`/.rvm/scripts/rvm"

Now edit your .bash_profile using this command

sudo gedit /home/$USER/.bash_profile

Make sure you have these lines there. If not add it.

if [ -f "$HOME/.bashrc" ]; then
  source $HOME/.bashrc
fi

Restart your terminal.

回答2:

If you want to get rid of rvm completely, use the command

rvm implode

But apart from that, once you install ruby 2.0.0 using rvm, are you using it also? Use the command

rvm use 2.0.0

and that should set it. To check which ruby is being used, try the command

which ruby

来源：https://stackoverflow.com/questions/22418070/link-ruby-to-rvm

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ruby-on-rails

ruby

gem

rvm