rvm is a function
基本安装完毕。。
最后加入path：
$ source ~/.rvm/scripts/rvm
6，但是之后运行 rvm install 1.9.2-head的时候就会出错：
ruby-1.9.2-head - #fetching Downloading source from http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_2. Error running 'svn checkout -q http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_2 /home/allen/.rvm/repos/ruby-1.9.2-head', please read /home/allen/.rvm/log/ruby-1.9.2-head/svn.checkout.log There has been an error while trying to fetch / update the source. Halting the installation. There has been an error fetching the ruby interpreter. Halting the installation.
原来我没装svn。。。。囧。。。。
