You mean total size of all the files in that folder?

If you have the ifsFileSize API I wrote or using the STAT api in the C runtime, you can determine each file's size within a directory. I've also written articles on recursing directories and reading each file name as if you were processing a database file's records. Then you could apply the STAT APi to each file that's read. But there's also Directory/Folder overhead.

What is your specific goal?

Gosh, what a dope I am!

RTVDIRINF DIR('/home/cozzi')

PRTDIRINF *DIR

Did a BING/GOOGLE Search for IFS Folder Size and found the Command QRYIFSLIB from

http://www.itjungle.com/fhg/fhg111407-story03.html

And followed the how to in there. 

Note, best to submit the command

CALL PGM(QRYIFSLIB) PARM('/*' '\s' '\X:*NONLOCAL') as it may take awhile for it to run.

Jeff