Commodore PC Ms-Dos 3.2 User's Manual page 157

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Set
Purpose:
Sets one string of characters in the environment equal to another
string for later use in programs.
Syntax:
set [string = [string]]
Comments:
You should use the set command only if you want to set values
for programs you have written.
When ms-dos sees a set command, it inserts the given string and
its equivalent into a part of memory reserved for the environ
ment. If the string already exists in the environment, it is replaced
with the new setting.
If you specify just the first string, set removes any previous set
ting of that string from the environment. Or if you use the set
command without options, ms-dos displays the current environ
ment settings.
When batch processing, you can also use the set command to
define your replaceable parameters by name instead of by
number. For example, if your batch file contains the statement
"type %file%", you could use the set command to set the name
that ms-dos will use for that variable. In the following command,
for example, set replaces the %file% parameter with the filename
taxes.86:
set file=taxes.86
To change the replaceable parameter names, you don't need to
edit each batch file. Note also that when you use text (instead of
a number) as a replaceable parameter, the name must be ended
by a percent sign.
The set command is especially useful in the autoexec, bat file,
because it lets you automatically set strings or parameters when
you start ms-dos. See Chapter 4, "Batch Processing," for more
information about the autoexec bat file.
MS-DOS Commands 85
Set
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Defining replaceable
parameters
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