To Run a job every hour without using crontab

Hi,

Can anyone help me in finding how to run a specific job every hour without using crontab.

Say for example i need to run a command ps -aux in the starting of every hour..

try with at command

at 

Hi itkamaraj,

Thanks ..

Also could you please provide the solution for this:

I need to write a script which adds all the digits in the parameter passed as an argument.

For example: If i am passing the parameter as "123" which is $1, i need to write a script for adding 1+2+3.

home work ?