How to run cron once, daily at 10pm
BashCronSystemScheduled TasksBash Problem Overview
I had entered:
* 22 * * * test > /dev/null
However, I am being notified via email that this is running every minute. I am confused I guess because I thought this was correct for what I am wanting.
Bash Solutions
Solution 1 - Bash
It's running every minute of the hour 22 I guess. Try the following to run it every first minute of the hour 22:
0 22 * * * ....
Solution 2 - Bash
Here are some more examples
-
Run every 6 hours at 46 mins past the hour:
46 */6 * * * -
Run at 2:10 am:
10 2 * * * -
Run at 3:15 am:
15 3 * * * -
Run at 4:20 am:
20 4 * * * -
Run at 5:31 am:
31 5 * * * -
Run at 5:31 pm:
31 17 * * *
Solution 3 - Bash
To run once, daily at 10PM you should do something like this:
0 22 * * *
Full size image: http://i.stack.imgur.com/BeXHD.jpg
Source: softpanorama.org
Solution 4 - Bash
Here is what I look at everytime I am writing a new crontab entry:
To start editing from terminal -type:
zee$ crontab -e
what you will add to crontab file:
0 22 * * 0 some-user /opt/somescript/to/run.sh
What it means:
[
+ user => 'some-user',
+ minute => ‘0’, <<= on top of the hour.
+ hour => '22', <<= at 10 PM. Military time.
+ monthday => '*', <<= Every day of the month*
+ month => '*', <<= Every month*
+ weekday => ‘0’, <<= Everyday (0 thru 6) = sunday thru saturday
]
Also, check what shell your machine is running and name the the file accordingly OR it wont execute.
Check the shell with either echo $SHELL or echo $0
It can be "Bourne shell (sh) , Bourne again shell (bash),Korn shell (ksh)..etc"
Solution 5 - Bash
The syntax for crontab
* * * * *
Minute(0-59) Hour(0-24) Day_of_month(1-31) Month(1-12) Day_of_week(0-6) Command_to_execute
Your syntax
* 22 * * * test > /dev/null
your job will Execute every minute at 22:00 hrs all week, month and year.
adding an option (0-59) at the minute place will run it once at 22:00 hrs all week, month and year.
0 22 * * * command_to_execute