F5 Alternative to systemd command

Hi,

I want to execute a bash script periodically. iCall requires the script to be rewritten as a tcl script so I am opting not to do that. This works fine with a Cron job however the business does not want this script run as a Cron. Instead I can schedule this on other flavours of linux with a systemd command however this command is not available on the F5 appliance.

Is there an alternative command to the systemd command on the F5 platform or is there another means that will allow me to run bash scripts periodically?