参考网址：http://blog.sina.com.cn/s/blog_9d6e035501010lol.html
When you run a rvm command such as
$ rvm use 1.9.3
but receive an error message of
RVM is not a function, selecting rubies with 'rvm use ...' will not work.
This error happens because under RVM's installation directory (normally $HOME/.rvm/bin), there is an executable named '
rvm'; whereas under $HOME/.rvm/scripts directory, there is a script called '
rvm'
. By
default, the 'rvm' executable is used, which cannot handle many rvm commands such as 'rvm use'.
One should load RVM into a shell session as a function (run the '
rvm' script). To do that, add the following line to '~/.bash_profile':
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" #load RVM into a shell session as a function PATH=$PATH:$HOME/.rvm/bin #Add RVM to PATH for scripting
Open a new terminal or run the following command to reload /.bash_profile in the current terminal. The problem should be solved.
$ source ~/.bash_profile