nvm: nvm.sh does not do anything

I installed node js with nvm but now I cant get it to work again

I finaly found that the bashrc lines were not executed when I was taking a session on the machine

[ -s “$NVM_DIR/nvm.sh” ] && . “$NVM_DIR/nvm.sh” had to be manualy executed

$ nvm
-bash: nvm: command not found

$ .nvm/nvm.sh 

$ .nvm/nvm.sh debug

$ [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"

$ nvm

Node Version Manager

Note: <version> refers to any version-like string nvm understands. This includes:
  - full or partial version numbers, starting with an optional "v" (0.10, v0.1.2, v1)
  - default (built-in) aliases: node, stable, unstable, iojs, system
  - custom aliases you define with `nvm alias foo`

...

• How did you install nvm? (e.g. install script in readme, homebrew):

this used to work :

wget https://raw.githubusercontent.com/creationix/nvm/v0.32.0/install.sh
bash install.sh
chmod +x .nvm/nvm.sh 
nvm ls-remote
 
nvm install 6.10.1