ruby on rails -v给出错误

Question

i am getting this error below

/usr/lib64/ruby/site_ruby/1.8/rubygems.rb:926:in `report_activate_error': Could not find RubyGem rails (>= 0) (Gem::LoadError)
from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:244:in `activate_dep'
from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:236:in `activate'
from /usr/lib64/ruby/site_ruby/1.8/rubygems.rb:1307:in `gem'
from /usr/bin/rails:18

i started with a ruby 1.8.7 & rails 2.3.11 then i installed rvm then installed ruby 2.0.0 & gem install rails 3.2.13 then started getting this error above. any help will be appreciated, thanks. i think it's a path issue of some sort but can't figure out, don't know much about unix stuff. i don't have root privs by the way.

this is my .bashrc if helps

 # .bashrc

   # User specific aliases and functions
   alias mv='mv -i'  
   alias rm='rm -i'
        alias cp='cp -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting
export HPATH=$HOME
export GEM_HOME=$HPATH/ruby/gems
export GEM_PATH=$GEM_HOME:/usr/lib64/ruby/gems/1.8
export GEM_CACHE=$GEM_HOME/cache
export PATH=$PATH:$HPATH/ruby/gems/bin
export PATH=$PATH:$HPATH/ruby/gems

this is .bash_profile

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH
unset USERNAME

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM$

Answer 1

rvm use 2.0.0

will switch to ruby 2.0.0

You can then install rails and create a gemset named rails-3.2.13

rvm use 2.0.0@rails-3.2.13 --create

then

gem install rails -v 3.2.13

you can also pass the --default switch to make 2.0.0 the default ruby

you can see a list if all installed ruby versions and which one is current and or default using

rvm list

this produces output like this

 rvm rubies

   ruby-1.9.3-p385 [ x86_64 ]
=* ruby-1.9.3-p392 [ x86_64 ]
   ruby-2.0.0-p0 [ x86_64 ]

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

UPDATE

Also, This seems like a PATH issue since your last comment. Im not sure about your bash_profile but the PATH may be wrong for rvm. Just use

export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:$PATH"

# Load RVM into a shell session *as a function*
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" 

in your bash_profile

and in your `.bashrc' try this

PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting