Chruby: unknown Ruby: ruby-2.2.0

Question

With chruby, why ruby-2.2.0in .ruby-versiondoes not work, then how chruby ruby-2.2.0will?

% whoami
mark
% sudo su myapp
% cd /home/www/myapp/
% whoami
chruby: unknown Ruby: ruby-2.2.0
myapp
% cat .ruby-version
ruby-2.2.0
% which ruby
/usr/local/bin/ruby
% chruby ruby-2.2.0
% which ruby
/home/www/myapp/.rubies/ruby-2.2.0/bin/ruby 

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Answer 1

In .ruby-versionjust put 2.2.0, i.e.

echo 2.2.0 > .ruby-version