To install create a folder somewhere in your filesystem with the nvm.sh file inside it. I put mine in a folder called .nvn.
.nvn
Then add two lines to your bash profile:
NVM_DIR=$HOME/.nvm . $NVM_DIR/nvm.sh
To download, install, and use the v0.1.91 release of node do this:
nvm install v0.1.91
And then in any new shell just use the installed version:
nvm use v0.1.91
If you want to track HEAD then use the clone command:
nvm clone
Then in any new shell you can get this version with:
nvm use HEAD
When you want to grab the latest from the node repo do:
nvm update