List github repos on your system and bulk update.
A simpler approach with a batch script:
:: updateGtiRepos.bat
:: %cd% means to to loop all folders in the script's dir
:: or you can pass a specific folder "C:\dir"
@echo off
for /f %%f in ('dir /ad /b %cd%') do (
cd /d %cd%\%%f
call git pull
cd ..
)
pause