MAILTO="" 0 0 * * * $HOME/bin/nightly.py > /dev/null 2>&1
The MAILTO line is optional. It disables email from cron jobs (useful when no MTA is installed).
tags | crontab every day
* * * * * /bin/date >> $HOME/x/log.txt
To run it every minute for the first half an hour
0-29 * * * * /bin/date >> $HOME/x/log.txt
Test run a cron script
Use run_as_cron.sh to test run a cron script in an emulated environment. It requires some initial set up. Check the comments in that script for more details. Basically, we need to dump the cron environment into a file first and then point to it in the script.