Scheduler Problems

We have 4 integration servers that are loadbalanced and with all the other configuration.We have lot of scheudulers that need to be run,so we have divided the scheduler’s on these 4 IS’s. But still these(Scheduler’s) eat up lot of memory on the the IS’s. I want to know if we can invoke any webMethods service from the Unix level,so that i can get rid of the scheduler and write a Cron job.
Thanks in advance