Hello,

I am taking an intro class and not getting this concept. Have tried various ways and come up frustrated.

Create a batch file to demonstrate replaceable parameters that will clear the screen and display all the *.%1 files (GIVEN on the command line) in the C:\windows\system32 directory. Replacable Parameters:
http://academic.pgcc.edu/~ebouling/lab3a.htm

From what I am understanding Replacable Parameters are the arguments that you give a command. I'll give you a run-down, as I can't seem to remember which command's help has this information.

%0 = batch file
%1-%9 = first-ninth argument

Thus:
Code: [Select]File.bat arg1 arg2 arg3
%0 = File
%1 = arg1
%2 = arg2
%3 = arg3

You can also use the help for 'call' which includes:
Code: [Select]In addition, expansion of batch script argument references (%0, %1,
etc.) have been changed as FOLLOWS:


%* in a batch script refers to all the arguments (e.g. %1 %2 %3
%4 %5 ...)

Substitution of batch parameters (%n) has been enhanced. You can
now use the following optional syntax:

%~1 - expands %1 removing any surrounding quotes (")
%~f1 - expands %1 to a fully qualified path name
%~d1 - expands %1 to a drive letter only
%~p1 - expands %1 to a path only
%~n1 - expands %1 to a file name only
%~x1 - expands %1 to a file extension only
%~s1 - expanded path CONTAINS short names only
%~a1 - expands %1 to file attributes
%~t1 - expands %1 to date/time of file
%~z1 - expands %1 to size of file
%~$PATH:1 - searches the directories listed in the PATH
environment variable and expands %1 to the fully
qualified name of the first one found. If the
environment variable name is not defined or the
file is not found by the search, then this
modifier expands to the empty string

The modifiers can be combined to GET compound results:

%~dp1 - expands %1 to a drive letter and path only
%~nx1 - expands %1 to a file name and extension only
%~dp$PATH:1 - searches the directories listed in the PATH
environment variable for %1 and expands to the
drive letter and path of the first one found.
%~ftza1 - expands %1 to a DIR like output line

In the above examples %1 and PATH can be replaced by other
valid values. The %~ syntax is terminated by a valid argument
number. The %~ modifiers may not be used with %*

If you launch this batch file like this: Mybatch exe cls

it will clear the screen and list the exe files in the C:\windows\system32 folder
That's all the sense I can make out of the question.

Code: [Select]@echo off
%2
dir C:\windows\system32\*.%1Run the batch file below. From a command shell with type: List_it.bat C O M
That will give a you an idea how the arguments work.

Code: [Select]::List_it.bat
@Echo Off
CLS
DIR C:\Windows\System32\*.%1%2%3