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Windows batch scripting and variable expansion

Posted on 2002-03-29
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Last Modified: 2013-12-03
I am attempting to set an env variable in the batch script and read in it's expansion from an external file, then print the value.

--batch file -----
set X=Z:

for /f %%i in (line.txt) do @set VAR=%%i

echo %VAR%

--line.txt -----
%X%

--As output -----
I am wanting to see Z: echo to the command window.  With what I have above, it will currently echo %X%, but I need that to expand also.

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Question by:mouse050297
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Accepted Solution

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cookre earned 100 total points
ID: 6906268
Your problem is that the command interpretor never actually sees what's being read from line.txt as anything other than data, i.e., it doesn't expand %%i beyond the single level.

This sort of thing, however, will get you what you want:

for /f %%i in (line.txt) do (
echo set VAR=%%i >aaa.bat
call aaa.bat
)
del aaa.bat
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Author Comment

by:mouse050297
ID: 6906489
I guess I should have added a little more of what I want to do once the variable is expanded.  I need to expand it within the original batch file.  Calling a secondary batch file is appropriate for my original question and I can reference it accordingly.  Here is what I am trying to do.  I am given the string
$(X)\msdos.sys
I break this into two files, $(X) into line.txt and \msdos.sys into line2.txt

I use character replacement on line.txt to change the contents to %X%

I read in and expand the %X%, then append the contents from line2.txt to create an object string.  Then "dir" the object to check for existence, if exist, append it to an additional line_final.txt, if not exist, then do nothing with the object string and read in the next line from the original.txt file and parse accordingly as above.  

As I write this, I see that your solution should work for what I am trying to do.  I will wait to see if you have any additional suggestions for a solution now that you know the rest of the story.
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Author Comment

by:mouse050297
ID: 7218640
Forgot that this was still open.  Points are yours.
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