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https://crontab.tech/every-4-hours
Cronjob let's you run a script to do a repetitive job in an efficent way, here's how you can schedule a cronjob for every 4 hours: Step 1: Edit your cronjob file by running "crontab -e" command. Step 2) Add the following line for every 4 hours interval: 0 */4 * * * /path/to/your/script. Step 3: Save the file.
https://unix.stackexchange.com/questions/183225/crontab-only-for-24-hours-but-every-4-hours
I recommend using at, not cron, because that way you won't have to remember to remove the crontab entry when the 24 hours are up.Just schedule 8 identical at jobs to run at the desired times (each 4 hours apart). In each job, you can, for example, use curl or wget, but of which can easily support writing the downloaded contents wherever you want it.
https://www.unix.com/unix-for-dummies-questions-and-answers/160529-execute-crontab-every-4-hours-begin-current-time.html
Normally if I set the crontab entry like this, Code: 00 */4 30 05 * root date >>/tmp/cronout. The above will execute the date command for every 4 hours like 4,8,12,16,20,24 on 30th May, for example I start the crontab at 02:00:00. But if I start the crontab at 09:15:00, it should execute the crontab command after 4 hours like 13:15:00, then 17:15:00 like this.
https://stackoverflow.com/questions/21042532/cron-to-run-every-4-hours-with-different-name-then-overwrite-mysql-db
This executes /bin/bash /path/to/your/script.sh every 4 hours at minute 15. And then let script.sh be: num=$(( ($(date "+%H") + 4 ) / 4)) /usr/bin/mysqldump -u DBUSERNAME -pDBPASSWORD DBNAME > /PATH/backup${num}.sql To get. hour num 0 1 4 2 .... 20 6 I use: $(date "+%H") returns the hour. $(date "+%H") + 4 returns the hour +4.
https://crontab.tech/every-hour
Step 1: Edit your cronjob file by running "crontab -e" command. Step 2: Add the following line for every hour interval: 0 * * * * /path/to/your/script-or-program. Step 3: …
https://www.unix.com/unix-for-dummies-questions-and-answers/160529-execute-crontab-every-4-hours-begin-current-time-2.html
Execute crontab for every 4 hours and begin from current time. At does sound more like a job for "at" than "crontab". Though "at" does of course use cron. Any recursive script like this should have a means of stopping the script (e.g. test for a "stop" file).
https://alvinalexander.com/linux/unix-linux-crontab-every-minute-hour-day-syntax/
To run a Linux/Unix crontab every hour of every day, you use a very similar syntax. Here’s a crontab entry I use to access a Drupal cron.php page five minutes after every hour using wget : # hit this url to run the drupal cron process every hour of every day # this command will run at 12:05, 1:05, etc. 5 * * * * /usr/bin/wget -O - -q -t 1 http://localhost/cron.php
https://serverfault.com/questions/39004/what-is-the-correct-syntax-to-run-cron-every-4-hours
0 0,4,8,12,16,20 * * * /cmd.sh That's probably how I would do it. This will run the job every 4 hours, on the hours of 00:00, 04:00, 08:00 12:00, 16:00, 20:00. This is just a little more verbose way of writing */4, but it should work the same.
https://crontab.guru/every-4-hours
sunday (non-standard) Cron job every 4 hours is a commonly used cron schedule.
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