Added CronJob task

Linux/Create a Cron Job.md

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+# Problem Statement
+
+The Nautilus system admins team has prepared scripts to automate several day-to-day tasks. They want them to be deployed on all app servers in Stratos DC on a set schedule. Before that they need to test similar functionality with a sample cron job. Therefore, perform the steps below:
+
+a. Install *cronie* package on all Nautilus app servers and start crond service.
+
+b. Add a cron */5* ** * echo hello > /tmp/cron_text for root user.
+
+## Solution
+
+### 1. SSH into the First App Server
+
+```bash
+ssh tony@stapp01
+```
+
+### 2. Switch to the Root User
+
+```bash
+sudo su
+```
+
+### 3. Install the *cronie* Package
+
+```bash
+yum install cronie -y
+```
+
+### 4. Start the `crond` Service
+
+```bash
+systemctl start crond
+systemctl enable crond
+```
+
+### 5. Edit the Root User’s Crontab
+
+Open the crontab editor for the root user:
+
+```bash
+crontab -e
+```
+
+In the editor, add the following line to schedule the job to run every 5 minutes:
+
+```bash
+*/5 * * * * echo hello > /tmp/cron_text
+```
+
+### 6. Verify the Crontab Entry
+
+```bash
+crontab -l
+```
+
+You should see the following line in the output:
+
+```bash
+*/5 * * * * echo hello > /tmp/cron_text
+```