Run cron once a day

#run a cron once a day at 3am
0 3 * * *

How to run a script in crontab every day

 +---------------- minute (0 - 59)
 |  +------------- hour (0 - 23)
 |  |  +---------- day of month (1 - 31)
 |  |  |  +------- month (1 - 12)
 |  |  |  |  +---- day of week (0 - 6) (Sunday=0 or 7)
 |  |  |  |  |
 *  *  *  *  *  command to be executed

Source: stackoverflow.com

How to run a script in crontab every day

  30 2 * * * /your/command
# ^  ^
# |   hour
# minute

Source: stackoverflow.com

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