Commands are extracted from an input file in card-image format. The input file is referenced by the SYSIN DD statement and may be any LRECL=80 data set.
Only the first 72 columns of the record can contain command data; the remainder of the record is ignored. A command may be preceded by one or more spaces and is terminated by a space. Any data (including additional blanks) after the command, is assumed to be operands or parameters associated with the command.