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Editorial Team
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Asked: 2026-05-27T07:23:42+00:00

I’ve installed new Rails 3.1.3 using gem # gem install rails Then type: wbednarski@mbp13:~$

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I’ve installed new Rails 3.1.3 using gem

# gem install rails

Then type:

wbednarski@mbp13:~$ rails
Rails is not currently installed on this system.
To get the latest version, simply type:

$ sudo gem install rails

You can then rerun your "rails" command.

More WTF:

wbednarski@mbp13:~$ which rails
/usr/bin/rails

How is it possible that command rails exist but Rails is not installed and how to fix it?

EDIT:

wbednarski@mbp13:~$ sudo gem install rails
Password:
Successfully installed rails-3.1.3
1 gem installed
Installing ri documentation for rails-3.1.3...
Installing RDoc documentation for rails-3.1.3...

then

wbednarski@mbp13:~$ rails -v
Rails is not currently installed on this system. To get the latest version, simply type:

    $ sudo gem install rails

You can then rerun your "rails" command.
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1 Answer

  1. Editorial Team

    I would recommend not using the system installed ruby or install gems in the system directories. There are a couple projects out there for handling installations of different ruby versions and gems. The first and most well known is rvm. The other one I know about is rbenv. RVM might be a good choice to start with and you can decide later on if you want to try rbenv.

    RVM is beneficial since it installs to your local home directory whichever ruby version you want and the gems too. This alleviates the issue of needing the correct permissions and $PATH issues.

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