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Batch file's are text files with commands that are executed. DOS and windows style.
How to write to a text file.
Use echo command and redict the output to a text file. Redict with two > appends to the file.
echo Hello > test.txt
echo World >> test.txt
Get Current directory
The working directory is stored in "%CD% and the directory when the bat was run is stored in %~dp0.'
How to Access Environment Variable
Put it inside %.
%QT_DIR%
Reference