'execute crontab twice daily at 00h and 13:30

i want to execute a script twice daily at 00:00 and 13:30 so i write :

0,30 0,13 * * *

it seems wrong for me, because like this, the script will fire at 00:00 , 00:30 , 13:00 and 13:30. Any idea ?

croncrontab


Solution 1:[1]

Try this-: 00 01,13 * * *

it will run at 1 A.M and 1 P.M

Solution 2:[2]

You can not do that with cron on a single line. You have to create 2 separate lines like so:

# Will run "YourCommand" at 00:00 every day of every months
#Min   Hours   D of the M       Month   D of the Week   Command
0      0       *                *       *               YourCommand

# Will run "YourCommand" at 13:30 every day of every months
30     13      *                *       *               YourCommand

Or as a single line you can run a command every x hours, like so:

# Will run "YourCommand" every 12 hours
0   */12   *   *   *   YourCommand

Solution 3:[3]

Try this out: 0 6,18 * * *

it will run at minute 0 past hour 6 and 18

Or you can try it out on cronguru

Solution 4:[4]

try ...

00,30 00,13 * * * [ `date +%H%M` == 1330 ] || [ `date +%H%M` == 0000 ] && logger "its time"

Solution 5:[5]

30 0,13 * * * somecommand.sh

This is just purely an example, but you will see that this is a cron entry that will run at 0:30AM and then 1:30PM (13 is 1 in military time). Just comma separate the hours, or comma separate whatever section of the cron.

Solution 6:[6]

Try this out:

0 1,13 * * *

What the above code means:

Cron will run at minute 0 past hour 1 and 13

Sharing a screenshot from crontab.guru

crontab-guru

Solution 7:[7]

try this,

0 10 9/12 ? * *

At second :00, at minute :10, every 12 hours starting at 09am, of every day

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Baby Groot
Solution 2
Solution 3 Nimish
Solution 4
Solution 5 David Jeffery
Solution 6 Ankit Jindal
Solution 7 malinda sanjaka

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