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# start the server:
mongod --dbpath /path/to/data/to/be/stored --logpath /log/path/mongo.log

# enter the shell:
mongo
# or
mongos

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Setup for MariaDB / MySQL on Manjaro Linux

Follow these steps for a PHP-MariaDB project:

sudo pacman -S php mariadb mariadb-clients mariadb-libs
sudo mariadb-install-db
sudo systemctl enable mariadb.service
sudo systemctl start mariadb.service
sudo systemctl status mariadb.service

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# make packages up to date
sudo pacman -Syu

# install Docker
sudo pacman -S docker

# start Docker service
sudo systemctl start docker.service

# stop Docker service

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import os

def create_folders(num, prefix=''):
    """Creates specified numbers of folders with a prefix in front of each"""
    for num in range(1, num+1):
        if not os.path.exists(f"{prefix}{str(num)}"):
            os.makedirs(f"{prefix}{str(num)}")

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# add following lines to the .bashrc file

alias java11='/usr/lib/jvm/java-11-openjdk/bin/java'
alias javac11='/usr/lib/jvm/java-11-openjdk/bin/javac'
alias java16='/usr/lib/jvm/jdk-16.0.1/bin/java'
alias javac16='/usr/lib/jvm/jdk-16.0.1/bin/javac'
alias jshell16='/usr/lib/jvm/jdk-16.0.1/bin/jshell'

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sudo pacman -Sy postgresql
sudo -u postgres -i initdb /var/lib/postgres/data
sudo systemctl start postgresql && sudo systemctl status postgresql
sudo systemctl enable postgresql
sudo su - postgres
psql

# SQL commands

exit

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// Fast:
function getMaxSubSum(arr) {
  let maxSum = 0;
  let partialSum = 0;

  for (let item of arr) { // for each item of arr
    partialSum += item; // add it to partialSum
    maxSum = Math.max(maxSum, partialSum); // remember the maximum
    if (partialSum < 0) partialSum = 0; // zero if negative
  }

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const sortArrayObjs = function(arr, prop1, prop2) {
  let sort1 = [...arr].sort((a, b) => {
    if (a[prop1] == b[prop1]) {
      if (a[prop2] === b[prop2]) return 0;
      return (a[prop2] < b[prop2]) ? -1 : 1;
    } else {
      return (a[prop1] < b[prop1]) ? -1 : 1;
    }
  });
  return sort1;

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var el = function (element) {
  if (element.charAt(0) === "#") {
    
    // If passed an ID...
    
    return document.querySelector(element); // ... returns single element
  }
    
  return document.querySelectorAll(element); // Otherwise, returns a nodelist
};

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const { exec } = require("child_process");

exec("ls -la", (error, stdout, stderr) => {
  
  if (error) {
      console.log(`error: ${error.message}`);
      return;
  }
  
  if (stderr) {