Chapter 6 / Command Reference
SHIFT
SHIFT
Internal
: I
U
Lets you use more
than
the
usual
ten
replaceable
parameters
(0%-9%)
in
batch file processing.
Notes
and
Suggestions
•
To
see how SHIFT works, suppose a batch file, Money.bat,
contains replaceable parameters, defined on
the
left
in
the
fol-
lowing chart. When you enter
the
SHIFT command, each defi-
nition shifts one place. Instead of replacing
%n,
it
replaces
%n-l.
Definitions Before Definitions After
Shift
Shift
%0
= Money
%0
=
Pharm.dat
%1
=
Pharm.dat
%1
= Autodeal.dat
%2
= Autodeal.dat
%2
=.
Hardware.dat
%3
= Hardware.dat
%3
= Grocery.dat
%4
= Grocery.dat
%4
= Dimestor.dat
%5
= Dimestor.dat
%5
= Theater.dat
%6
= Theater.dat
%6
= Cafe.dat
%7
= Cafe.dat
%7
= Photo.dat
%8
= Photo.dat
%8
= Beauty.dat
%9
= Beauty.dat
%9
= Undefined
As you can see,
%9
is now open to be redefined. Money,
on
the
other hand, no longer replaces any parameter.
If
you must
refer to Money again, you must·
set
an
environment variable
equal to
%0
before you use
the
SHIFT command.
•
You
can execute
as
many shifts
as
needed.
If
you
do,
however,
include ECHO
%n
in
your file
as
needed to keep
track
of each
replaceable
parameter's
current
definition.
170
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