Guide

Minutes

Minutes are the part of hour we want , value must be between 0-59, suppose you want task to be execute on 12 th minute of hour then the value of minute should be 12, If you want to execute a task on each minute then value should be * .

Hour

Value must be between 0-23, suppose you want task to be execute on 12 th hour of day then the value of hour should be 12, If you want to execute a task on each hour then value should be * .

Day of Month

Value must be between 1-31, suppose you want task to be execute on 12 th day of month then the value of day should be 12, If you want to execute a task on each day then value should be * . While adding value we recommend adding value less than 29 because , it will execute in feb in value >28

Month

Value must be between 1-12, suppose you want task to be execute on 12 th month of year then the value of month should be 12, If you want to execute a task on each month then value should be * .

Day of Week

Value must be between 0-6, suppose you want task to be execute on 3 th day of week then the value of day should be 3, If you want to execute a task on each day then value should be * . [Note : Some systems supports 7 as sunday. Please check compatibility before using]

Username

Value should be your Username or root or bash , depends on your config.

Path

Enter path of script, or read guide below

How it works?

                    # ┌───────────── minute (0 - 59)
                    # │ ┌───────────── hour (0 - 23)
                    # │ │ ┌───────────── day of the month (1 - 31)
                    # │ │ │ ┌───────────── month (1 - 12)
                    # │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday;
                    # │ │ │ │ │                                   7 is also Sunday on some systems)
                    # │ │ │ │ │
                    # │ │ │ │ │
                    # * * * * * 

Next Steps

Now Login to your terminal, Now use commands below

 
                            
                            $  sudo touch ~/filenamehere

                        

Making changes here

 

                            $  nano ~/filenamehere

                        

enter all the commands here which you want to execute. for example

 

                            #!/bin/bash
                            sudo service apache2 restart
                            sudo apt update
                            sudo apt upgrade -y
                            sudo apt autoremove -y
                            sudo reboot

                        

Now press Ctrl + X and then press y & click enter. This will save your file.
Now time to make sure your script is executable

                            sudo chmod +x ~/filenamehere

                        

Now the last bit, add it to your crontab. To do that, type in

                            crontab -e

                        

When the file opens at the bottom of it, Copy output from above and paste on bottom line then Save the file and exit from it. To make sure you’ve added the cron, type in

                            crontab -l

                        

You should see the command you added at the bottom. Some of above content is copied from this post of JustInClicks.com Blogs . Please visit link to get more details.