Executing SharePoint schdeuled timer jobs is pretty simple.
If you have a scenario where you need all scheduled jobs to be run immediately you can use STSADM.EXE utility to achieve this by using the following command:
STSADM -O -EXECADMSVCJOBS
If you want to run a specific timer job you can use the following command:
STSADM -O RUNTIMERJOB -NAME (NAME OF TIMER JOB) -URL (SITE COLLECTION URL)
If you require any other information on STSADM commands you can check this link for a full list of available commands for STSADM command line utility.