@echo off

SET SOME_VAR="first.txt"
DEL /S "%SOME_VAR%" || echo "file not found"
CALL :_ex

EXIT /B %ERRORLEVEL%

:_ex
echo >first.txt
git add .
git commit -m "First commit"
echo "one">>first.txt
git commit -am "Added one"
echo "two">>first.txt
git commit -am "Added two"
git push -u origin master
git reset --hard HEAD~1
echo "three">>first.txt
EXIT /B 0