cru enables you to check/add/delete cron job on your Asuswrt Merline Wifi Router. Because Asuswrt does not save all the cron job by the limited storage, you should add cron job at /jfss/scripts/init-start, so the cronjob will be done as designed.
Basic functions of cron job in Asuswrt Merlin Wifi Router
Add a new cron job
cru a {id} min hour day moth week command
Where:
- id – Unique ID for each cron job
- min – Minute (0-59)
- hour – Hours (0-23)
- day – Day (0-31)
- month – Month (0-12 [12 is December])
- week – Day of the week(0-7 [7 or 0 is Sunday])
- command – Script or command name to schedule.
List cron jobs
cru l
Delete cron job
cru d {id}
Example of Cron Job
Let us add cron job on Asuswrt Merlin Wifi router to ping gateway every 1 hour, run:
cru a pinggw "0 * * * * /bin/ping -c 10 -q 192.168.2.254"
Above cron job will run /bin/ping command that sends only 10 pings and only display output at start.
To list current jobs run:
cru l
To delete current jobs run:
cru d pinggw
Verify it:
cru l
Create/Edit a script called services-start
Type the following command
vi /jffs/scripts/init-start
And add your command like below. Below is the case to update DNS every 10mins
cru a ddns "*/10 * * * * /usr/sbin/wget -O /dev/null 'http://ddns.dnszi.com/set.html?user=<your_id>&auth=<your_auth>&domain=<your_domain>&record=<your_record>'"
Reboot Asuswrt every 12 hours
cru a reboot12 "0 */12 * * * /sbin/reboot"
Reboot Asuswrt at 5:30 AM
cru a reboot0530 "30 5 * * * /sbin/reboot"
To enable boot time support for /jffs/scripts/, you should check following options: