There are a multitude of ways to check the IBM i OS version on your IBM i System (No it is NOT an AS400 or iSERIES machine – Don’t argue. Don’t!)

You can do it from Control Language Programs

You can do it from RPG programs

You can do it from SQL

You can do it from the command line a million different ways

I tend to use command DSPSFWRSC and then press F11:

DSPSFWRSC

But if this all sounds too technical — Here is another really simple way to do this – just type:

DSPJOB OUTPUT(*PRINT)

Obviously this will generate a spool file and this shows the IBM i information at the top of every page: