Understand the Crontab format in Linux

· In this tutorial we have a small description on how crontab works and looks like. 

·  Example of crontab job. 

30 20 * * * /bin/ksh /home/collect_stats.sh 1> /dev/null 2>&1

30 20 * * * /bin/ksh /home/collect_stats.sh 1> /dev/null 2>&1

We have script running at 20:30 every day.