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
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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