how to access share folder in ubuntu virtualbox

sudo adduser [username] vboxsf

enable root and ssh root login

step 1:

   sudo passwd root

step 2:

    sudo passwd -u root 

you want to work on a root console you can also use 

   sudo -i

If you want to disable root account in Ubuntu you need to lock the root account by using the following command 

  sudo passwd -l root

You also need to edit /etc/ssh/sshd_config, and comment out the following line:

PermitRootLogin without-password

Just below it, add the following line:

PermitRootLogin yes

Then restart SSH:

service ssh restart

npm config settings

1. I run this command:

   npm config set strict-ssl false

2. Then set npm to run with http, instead of https:

   npm config set registry "http://registry.npmjs.org/"

3. Then I install packages using this syntax:

   npm --proxy http://username:password@cacheaddress.com.br:80 install packagename

npm config set proxy http://proxy.company.com:8080
npm config set https-proxy http://proxy.company.com:8080

d

各种坑之遇险记

原文：http://www.cnblogs.com/cdjboy/p/5656017.html