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var n = 1234567890;
alert( n.toString(36) ); // kf12oi

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function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

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mongoexport --host 127.0.0.1 -d database_name -c collection_name --port 27017  --limit=1000000 --vvvvvv --out /full/path/to/file.json

geega

<?php 


$data = [
    '2019-02-01 10:00:00',
    '2019-02-01 10:01:00',
    '2019-02-01 10:02:00',
    '2019-02-01 10:03:00',
    '2019-02-01 10:04:01',
    '2019-02-01 10:04:25',

geega

Сhange hostname file

sudo nano /etc/hostname

Change name

ubuntu18-laptop

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Mounting VirtualBox shared folders on Ubuntu Server 16.04 LTS

This guide will walk you through steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest. Tested on Ubuntu Server 16.04.3 LTS (Xenial Xerus)

Steps:

1. Open VirtualBox
2. Right-click your VM, then click Settings
3. Go to Shared Folders section
4. Add a new shared folder
5. On Add Share prompt, select the Folder Path in your host that you want to be accessible inside your VM.

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# Backup to tgz file 
$ docker save myusername/myproject:latest | gzip -c > myproject_img_bak20190103.tgz

# Restore from file 
$ gunzip -c myproject_img_bak20190103.tgz | docker load

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const fs = require('fs-extra')

fs.copy('dbDump.zip', 'dbDumpCopy.zip')
  .then(() => console.log('File was successfully copied!'))
  .catch(err =>console.error)

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const fs = require('fs');
fs.createReadStream('dbDump.zip').pipe(fs.createWriteStream('dbDumpCopy.zip'));

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let message = "I love node";
const crypto = require('crypto');
let hashed=crypto.createHash('md5').update(message).digest("hex");