Simple Example on how to run .sh file by using crontab on unix

Here are the simple steps on how to check if you can execute the shell scripts on a unix server by using the crontab functionality. Crontab is disabled by default, so this would need to be activated, this post assumes that you already have the crontab functionality enabled
March 19, 2014
UNIX

The goal

We want to automate the execution of a shell script on a unix server


1. Allow user to use cron

Place username into /etc/cron.allow file

redfernd


2. Create a script

For the purpose of testing, create a shell script into your tmp directory called testingcron.sh

vi /tmp/testingcron.sh

Then enter in the following information:

#!/bin/bash #testing sh echo "Hello World"

Test this by running the script:

. /tmp/testingcron.sh


3. Make a cron string

I want to run my script every two minutes, so my cron will look like this:

*/1 * * * * /tmp/testingcron.sh > home/redfernd/cron.log

The cron schedule above will ensure that the testingcron.sh script is executed every minute and the results are placed into the home/redfernd/cron.log file


4. Register your cron

Whilst logged in as your user, type in the following:

crontab -e

Then enter in the following string (That you created earlier):

*/1 * * * * /tmp/testingcron.sh > home/redfernd/cron.log


5. Change the permissions of the shell

Make sure the owner has execute permission against the script

chmod 744 /tmp/testingcron.sh


6. Check if the cron was ran

Review the home/redfernd/cron.log and check is the cron has ran hello world for you

About the author

Daniel is a Technical Manager with over 10 years of consulting expertise in the Identity and Access Management space.
Daniel has built from scratch this blog as well as technicalconfessions.com
Follow Daniel on twitter @nervouswiggles

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