If you save these JCL files
as
NEST0/JCL, NEST1/JCL, and
NEST2/JCL and then compile
and
execute NEST0/JCL, the following
SYSTEM/JCL results:
I
I.
NEST01 JCL
II.
NEST1/JCL
I
I.
NEST21 JCL
•
nested
procedure
example
(Nest
0)
this
is
the
first
nest
(Nest
1)
•
this
is
the
second
nest
(Nest
2)
•
this
is
the
end
of
the
first
nest
(Nest
1)
this
is
the
end
of
the
primary
JCL
(Nest
0)
The IIINCLUDE macro can
be
used
to
compile a large JCL procedure
from a series of smaller JCL routines.
If
the finished SYSTEM/JCL file
is a procedure that will be executed many times, you can easily save
it by copying SYSTEM/JCL to a file with another name.
U
sing
the
Special
%Symbol
The % symbol
is
used
to
pass character values
(in
hex) to the system
as
though they came from the keyboard. The syntax is:
%character value
Below are some valid values
and
their results:
Hex Value
09
0A
1F
Result
Position
to
next tab stop
(every 8 columns)
Linefeed
Clear screen
The value of any printable character can also
be
used, although
control characters (characters with a value less than hex 20) are
generally used. (See Appendix C for a list of characters, values, and
actions performed
on
the video display.)
Examples
You should place the clear screen character at the start of a line. For
example:
'X.
1F
1/
PA
USE
Ins
e r t
dis
f,
in
d r i
l.J
e 1 t
pre
s s
(ENTER)
clears the screen and displays the JCL line
in
the top left corner of
the screen.
The tab and Iinefeed characters, used to position comments or lines
on
the screen, should always
be
placed AFTER the period
in
the
comment line or the macro
in
an
executable line. For example:
A-29
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