From 74f3e9c1240571919377a9437123f1662399caa3 Mon Sep 17 00:00:00 2001
From: YIk Teng Hie <tenghie.yik@razer.com>
Date: Sat, 22 May 2021 11:24:44 +0800
Subject: [PATCH] ubuntu

---
 ubuntu/README.md  | 77 +++++++++++++++++++++++++++++++++++++++++++++++
 vagrant/README.md | 22 ++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 ubuntu/README.md
 create mode 100644 vagrant/README.md

diff --git a/ubuntu/README.md b/ubuntu/README.md
new file mode 100644
index 0000000..7c3fa5c
--- /dev/null
+++ b/ubuntu/README.md
@@ -0,0 +1,77 @@
+# 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
+```
+
diff --git a/vagrant/README.md b/vagrant/README.md
new file mode 100644
index 0000000..cbc61e4
--- /dev/null
+++ b/vagrant/README.md
@@ -0,0 +1,22 @@
+# 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
+```
+