CODEWITHSUNDEEP
cron
user1856596
user1856596

Reputation: 7243

Running a cron job at 2:30 AM every day

How to configure a cron job to run every night at 2:30? I know how to make it run at 2, but not 2:30.

Upvotes: 389

Views: 725071

Answers (8)

msd
msd

Reputation: 11

0 30 2 * * *

0 - first second of an minute

30 - 30th minute of an hour

2 - 2nd hour of an day

(*) - every day

(*) - every month

(*) - every day of week

But the seconds is optional

use this site for reference : http://www.cronmaker.com/

Upvotes: 0

Sally
Sally

Reputation: 21

30 2 * * * Every Day at 2:30 Am

30-31 2 * * * Every Day at 2:30 -31 am

Along with he answers its important to understand the cron expressions , i face a lot of difficulty in understanding . But an intuitive way to understand is given here .

Upvotes: 2

Artur Barseghyan
Artur Barseghyan

Reputation: 14232

As an addition to the all above mentioned great answers, check the https://crontab.guru/ - a useful online resource for checking your crontab syntax.

What you get is human readable representation of what you have specified.

See the examples below:

Upvotes: 4

Praddyumna Sangvikar
Praddyumna Sangvikar

Reputation: 149

30 2 * * * wget https://www.yoursite.com/your_function_name

The first part is for setting cron job and the next part to call your function.

Upvotes: 1

fedorqui
fedorqui

Reputation: 290255

As seen in the other answers, the syntax to use is:

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

Following the crontab standard format:

 +---------------- 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

It is also useful to use crontab.guru to check crontab expressions.

The expressions are added into crontab using crontab -e. Once you are done, save and exit (if you are using vi, typing :x does it). The good think of using this tool is that if you write an invalid command you are likely to get a message prompt on the form:

$ crontab -e
crontab: installing new crontab
"/tmp/crontab.tNt1NL/crontab":7: bad minute
errors in crontab file, can't install.
Do you want to retry the same edit? (y/n)

If you have further problems with crontab not running you can check Debugging crontab or Why is crontab not executing my PHP script?.

Upvotes: 83

A.A
A.A

Reputation: 2713

  1. To edit:

    crontab -e

  2. Add this command line:

    30 2 * * * /your/command
    • Crontab Format:

      MIN HOUR DOM MON DOW CMD

    • Format Meanings and Allowed Value:
    • MIN Minute field 0 to 59
    • HOUR Hour field 0 to 23
    • DOM Day of Month 1-31
    • MON Month field 1-12
    • DOW Day Of Week 0-6
    • CMD Command Any command to be executed.

  3. Restart cron with latest data:

    service crond restart

Upvotes: 185

DevilCode
DevilCode

Reputation: 1100

An easy way to write cron is to use the online cron generator It will generate the line for you. One thing to note is that if you wish to run it each day (not just weekdays) you need to highlight all the days.

Upvotes: 10

JoG
JoG

Reputation: 6732

crontab -e

add:

30 2 * * * /your/command

Upvotes: 620

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