In Vixie cron, which is possibly the most common, you can do this almost exactly like a shell script. VARIABLE=value PATH=/bin:/path/to/doathing 0 0 * * * doathing.sh $VARIABLE The man page says: An active line in a crontab will be either an environment setting or a cron command. An environment setting is of the form, … Read more
You can also specify the exact values for each gr 0 2,10,12,14,16,18,20 * * * It stands for 2h00, 10h00, 12h00 and so on, till 20h00. From the above answer, we have: The comma, “,”, means “and”. If you are confused by the above line, remember that spaces are the field separators, not commas. And … Read more
you may use this: # m h dom mon dow command 0 13,14,15 * * * /home/user/command your /home/user/command will be run at 13:00, 14:00 and 15:00
Create the backup (export): crontab -l > /some/shared/location/crontab.bak Import it from the new user: crontab /some/shared/location/crontab.bak
Depending on your version of cron, you should be able to do (for hours, say): 1-23/2 Going by the EXTENSIONS section in the crontab(5) manpage: Ranges can include “steps”, so “1-9/2” is the same as “1,3,5,7,9”. For a more portable solution, I suspect you just have to use the simple list: 1,3,5,7,9,11,13,15,17,19,21,23 But it might … Read more
I ran into this same problem. I have a docker container that runs cron to execute some shell scripts periodically. I too had a hard time finding out why my scripts would run fine when I manually executed them inside the container. I tried all the tricks of creating a shell script that would run … Read more
Cron utility is an effective way to schedule a routine background job at a specific time and/or day on an on-going basis. Linux Crontab Format MIN HOUR DOM MON DOW CMD Example::Scheduling a Job For a Specific Time The basic usage of cron is to execute a job in a specific time as shown below. … Read more
Here’s my example crontab I always use as a template: # Use the hash sign to prefix a comment # +—————- minute (0 – 59) # | +————- hour (0 – 23) # | | +———- day of month (1 – 31) # | | | +——- month (1 – 12) # | | | … Read more
Run it every three days… 0 0 */3 * * How about that? If you want it to run on specific days of the month, like the 1st, 4th, 7th, etc… then you can just have a conditional in your script that checks for the current day of the month. if (((date(‘j’) – 1) % … Read more