For other shell newbies trying to fix the PATH variable
After following instructions in accepted answer, check and modify your PATH variable if necessary :
env | grep PATH
if you see "rvm" anywhere, you need to figure out where you are setting PATH and modify. I was setting it in 3 files - so check all the following files:
vim .bashrc
Delete the lines in the file referencing rvm using the dd command. :wq to save and exit.
source .bashrc
to "reload"
Repeat this process (starting with the vim command) for .profile and .bash_profile