Really, I don\'t know what happened. Excuse me if this question is so NOOB, but I can\'t find the solution for this problem.
-bash: rvm: command not f
To start using RVM, you'll need to enter source /Users/yourusername/.rvm/scripts/rvm into your terminal (of course, insert your real username in place of yourusername).
source /Users/yourusername/.rvm/scripts/rvm
yourusername