Batch File For loop over a list of file extensions with exclusions?

Question

Say i have the following files in a directory* /file.js* /file2.min.js* /file1.jshow can i write a batch for loop such that all ".js" files are picked up but ".min.js" are not and the output of the .js filename can be changed to append .min.jseg: for %%A IN (*.js) DO @echo %%A "->" %%~nA ".min.js"would ideally produce the following, and note the file2.min.js is not displayed to the left.* file.js -> file.min.js* file1.js -> file1.min.jsThanks for your help.

Answer 1

Yes, you can use the following batch file script to loop over all ".js" files in a directory, excluding the ones with ".min.js" extension and output their filenames with the desired format:

@echo off

setlocal enabledelayedexpansion

for %%A IN (*.js) DO (

 set filename=%%A

 set extension=!filename:~-7!

 if not !extension! == .min.js (

   set filename=!filename:.js=.min.js!

   @echo %%A "->" !filename!

 )

)

Explanation:

1. setlocal enabledelayedexpansion is used to enable the delayed expansion of variables in a loop
2. The for loop iterates over all files with ".js" extension in the current directory
3. Inside the loop, set filename=%%A sets the filename variable to the current file name
4. set extension=!filename:~-7! extracts the last 7 characters (i.e., the file extension) from the filename variable and sets the extension variable to it
5. if not !extension! == .min.js checks if the file extension is not ".min.js"
6. If the condition is true, set filename=!filename:.js=.min.js! replaces the ".js" extension with ".min.js" in the filename variable
7. Finally, @echo %%A "->" !filename! outputs the original file name followed by the new file name in the desired format.