Bat

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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