Chapter 6 / Command Reference
MS-DOS automatically
substitutes
each occurrence
of
file-
name-in
all
batch
files-with
Myfile.
Now
suppose
you
want
to
substitute
Samfile
for
filename. Reset filename by typing:
set
fllename=samflle
I
ENTER!
To
void
the setting, type:
set
filename=
[ENTER!
• The SET command lets you
write
versatile batch files. An
example
is
to
use
the
SET
and
the
PROMPT
commands
together to
set
up a series of easy-to-change system prompts.
Suppose you have four system prompts, all of which you use
often.
Rather
than
repeatedly entering
the
PROMPT
com-
mand
with
parameters,
use
batch
files to
do
the
work
for
you.
First, assign each prompt a unique
parameter
that
is to repre-
sent
it
in
a
batch
file.
I promptd = default prompt (current drive)
promptl
=
time
and
date
• prompt2
current
directory
I prompt3 = version number
and
a
greater-than
symbol
Then
set
a name
for
each string (the codes required
by
the
PROMPT command). For example:
set
promptd=$n$g
I
ENTER
I
set
prompt1=The
tlme
is
$t$
__
The
date
is
$d
I
ENTER
I
set
prompt2=$p
IENTER!
set
prompt3=$v$g
I
ENTER
I
166
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