How do I update the CA Scheduler CALENDAR using the batch utility?
Use CAJUTIL0 utility to update your CA Scheduler CALENDARs through batch.
//UTIL EXEC CAJUTIL0
//SYSIN DD *
ALTER CAL NAME=calname,YEAR=2021,JAN1=NULL to indicate non work day
ALTER CAL NAME=calname,YEAR=2021,JAN5=W for work day
//