npm & node Installation or update

Linux & Mac (Slightly different)

1- To check if npm is installed or not, type

$ npm -v
This would be the output in terminal
umer@Umer:~$ npm -v
3.8.6

2- If npm is not installed, then run these commands

1. $ sudo npm install npm -g
   
2. $ npm -v
3.8.6
   

3. Then check whether node and nodejs is installed by typing these commands

1. $ node -v
2. $ nodejs -v If it returns the version then it is installed
   It would look like this in terminal
   umer@Umer:~$ node -v
v6.0.0
umer@Umer:~$ nodejs -v
v4.4.3
   

4. For the installation of nodejs

1. $ sudo npm cache clean -f
2. $ sudo npm install -g n
3. $ sudo n stable