ubuntu

ubuntu/README.md

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+# Useful shell command
+
+* commands
+
+```shell
+// add a user to root group
+$ visudo
+
+# User privilege specification
+root    ALL=(ALL:ALL) ALL
+newuser ALL=(ALL:ALL)ALL
+
+hold `ctrl` and press `x` to save and exit
+```
+
+
+
+* run as root
+
+```shell
+user@host$ sudo su -
+
+// prompt will show root login
+root@host$ 
+```
+
+
+
+* add a user to a group
+
+```shell
+// create docker group
+$ sudo groupadd docker
+
+// add current user to group
+$ sudo usermod -aG docker ${USER}
+
+// restart to take effect
+```
+
+
+
+* change file permission
+
+```shell
+
+// excecute, read, write
+$ chmod 777 filename
+
+//
+```
+
+## node version manager [nvm](https://github.com/nvm-sh/nvm)
+
+* version manger for nodejs
+* use nvm to avoid npm version conflict installation
+* ubuntu 20.10 support node 12
+* ubuntu 19.10 support node 10
+
+```shell
+// installation
+
+$ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
+
+$ wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
+
+$ export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
+
+// to install node version 10.10.0
+$ nvm install 10.10.0
+
+// remove node to solve conflicting version
+$ sudo apt-get remove nodejs
+$ sudo apt autoremove
+```
+

vagrant/README.md

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+# Vagrant
+
+* virtualize CLI. Required VM provider such as HyperV, VirtualBox, Vmware 
+* Box at [vagrant app](https://app.vagrantup.com/boxes)
+
+* CLI (run as admin)
+
+```shell
+
+// init folder for vm setup
+$ vagrant init bento/ubuntu-19.10
+
+// spin up the vm
+$ vagrant up
+
+// login to vm
+$ vagrant ssh
+
+// shoutdown the vm
+$ vagrant halt
+```
+