As we know, Cron Jobs are nothing but Scheduled tasks in software environment which will be running at a specified frequency.

Examples:

How to setup CRON jobs for Windows/Windows Server, ME, XP, Vista, 7, 8, 8.1, 10, 2008, 2012, 2016, Etc. ­ ­ V­ ­ V­ V ­:INSTRUCTIONS:­ V­ ­ V­ VDownlo.

• Sending notifications to the users.
• Sending registered users list to the specified email id..etc.

Writing Cron Jobs are different in Cloud Servers than writing in Shared hosting.
In Shared hosting, you have options to add Cron Jobs in Cron Job Manager. You can see this option in Cpanel from the Shared Hosting providers.
In Cloud servers, we have to work with CLI (Command Line Interface) to write Cron Jobs.

Here I am going to explain the simple steps to write your own Cron Jobs on AWS EC2 Server.

a. First, you have to Log in to your AWS EC2 instance

b. Run the below command
$ crontab -e

Cron jobs are typically located in the spool directories. They are stored in tables called crontabs. You can find them in /var/spool/cron/crontabs. The tables contain the cron jobs for all users, except the root user. The root user can use the crontab for the whole system. To display contents of the root user’s crontab, use the less command. Automating Server Scripts with Cron. Cron is a software utility which uses a time-based job scheduler in Linux operating systems. You can use cron to schedule jobs to run at fixed times, dates, or intervals. If you are new to setting up php cron in windows task scheduler, go thoroughly through this blog. Tested on Windows10, Apache server and PHP 5.6 Create a Job Task Without Batch file.

When you run Crontab command for the first time you will get some of the existed editors options to open

1. /bin/ed
2. /bin/nano
3. /usr/bin/vim.basic
4. /usr/bin/vim.tiny

Choose 1-4?

Select option 2 and enter.
Now you will get an editor to add Cron Jobs.

Crontab For Windows Server 2012

c. Add your every file paths/function paths which you want to schedule.
Note that you should specify single file path per line

For example:
0 10 * * * php /var/www/public_html/api/src/cronjob/notification.php
OR
0 10 * * * /bin/php /var/www/public_html/api/src/cronjob/notification.php
Here I am mentioning about PHP file path which sends notifications to the users on every day 10:00am.

• First term is Cron expression i.e 0 10 * * *

Cron Expression Examples:
* * * * * // Run every minute. ex: for 5 mins => */5 * * * *
0 * * * * // Run on the hour, every hour ex: every 2hrs => * */2 * * *
0 23 * * * // Run at 11 p.m. every day
0 0,12 * * 6 // Run at midnight and midday every Saturday
30 2 */2 * * // Run every second day at 2.30 a.m.

5 stars are explained below:
1st star: Minute (ranges from 0-59)
2nd star: Hour (ranges from 0-23)
3rd star: Day (ranges from 1-31)
4th star: Month(ranges from 1-12)
5th star: Day-of-week (0-7. 0 & 7 is Sun. 1-Mon, 2-Tue...etc)

• Second term is PHP command path. I.e php or /bin/php
• Third term is PHP file Pathi.e /var/www/public_html/api/src/cronjob/notification.php

Command path will change depends on the programming language.

d. Once you enter your Cron Job Commands you have to save it.
To save type Cntrl+x and Select ‘Y’ and Enter.

e. To check whether your Cron Jobs is saved or not, run the below command.
$crontab -l

Now you can see your Cron Job file which has all your Cron Jobs.

For testing, you can schedule a task for a minute and check.
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Reading Time: 2minutesServers can automatically perform tasks that you would otherwise have to perform yourself, such as running scripts. On Linux cloud dedicated servers or VPS servers, the cron utility is the preferred way to automate the running of scripts. In this article, we’ll cover how to view the jobs scheduled in the crontab list. For an introduction to Cron check-out our KB: How To: Automate Server Scripts With Cron. Knowing how to set up crontab is an important skill, but even if you’re not editing these knowing how to view them is important as well.

How to View Jobs in Crontab

crontab -lcrontab -u username -lExample with user testuser:crontab -u testuser -l

View Daily Cron Jobs

View all the daily cron jobs:ls -la /etc/cron.daily/View a specific daily cron job:less /etc/cron.daily/filenameExample with file name logrotate:less /etc/cron.daily/logrotate

View Hourly Cron Jobs

First view all the hourly cron jobs:ls -la /etc/cron.hourly/

.htaccess For Windows Server

Then view a specific hourly cron job:less /etc/cron.hourly/filenameExample with file name 0anacron:less /etc/cron.hourly/0anacron

View Weekly Cron Jobs

First view all the weekly cron jobs:

Crontab For Windows Server

ls -la /etc/cron.weekly/Then view a specific weekly cron job:less /etc/cron.weekly/filenameExample with file name weeklyexample:less /etc/cron.weekly/weeklyexample

View Monthly Cron Jobs

Cron Windows Server 2008

First view all the monthly cron jobs:ls -la /etc/cron.monthly/Then view a specific monthly cron job:less /etc/cron.monthly/filenameExample with file name readahead-monthly.cron:less /etc/cron.monthly/readahead-monthly.cron

View /etc/crontab

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