Subtracts an integer from a field in the input buffer.
PROC command subtracts n
from the numeric value field pointed to by the input buffer pointer. If the input buffer pointer is not pointing to a field, or is pointing to a non-numeric value field, no operation occurs. If n
is not specified, or is a non-integer value, no operation occurs.
PROC command adds n
to the numeric value field pointed to by the input buffer pointer.