Install NVM, Nodejs, and pm2 on ubuntu.

nvm_node_pm2_install.sh

#!/bin/bash

# Function to install nvm
install_nvm() {
  echo "Installing NVM..."
  curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash

  # Source nvm script to make nvm command available in the current session
  export NVM_DIR="$HOME/.nvm"
  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
  [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
}

# Function to install the latest node LTS
install_node_lts() {
  echo "Installing latest Node.js LTS..."
  nvm install --lts
  nvm use --lts
}

# Function to install pm2
install_pm2() {
  echo "Installing PM2..."
  npm install -g pm2
}

# Check if nvm is installed
if ! command -v nvm &> /dev/null
then
  install_nvm
  
  # Source nvm script to make nvm command available in the current session
  export NVM_DIR="$HOME/.nvm"
  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
  [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
else
  echo "NVM is already installed."
fi

# Check if the latest Node.js LTS version is installed
NODE_LTS_VERSION=$(nvm ls-remote --lts | tail -1 | awk '{print $1}')
if ! nvm ls | grep -q "$NODE_LTS_VERSION"
then
  install_node_lts
else
  echo "The latest Node.js LTS version is already installed."
fi

# Check if pm2 is installed
if ! command -v pm2 &> /dev/null
then
  install_pm2
else
  echo "PM2 is already installed."
fi