Net.Data Administration and Programming Guide for OS/400

Using the SAY REXX Instruction With OS/400 V3R2 or V3R7

If you are running OS/400 V3R2 or V3R7 and a REXX program uses the SAY REXX instruction to write to stdout, then insert 12 blanks at the start of the string.

For example:

SAY '            STARTOFDATA'

The 12 blanks are ignored, but if not inserted, unpredictable results might occur.