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Autoexec is a CFG file for launching a game with set convars that will get automatically executed on launch.

To create an autoexec create a text document named 'autoexec' and save it with a .cfg extension. Place it inside your game / mod's cfg folder. Place all the convars inside the file with each convar on a seperate line. For example:

cl_showfps 1
maxplayers 1
sv_cheats 1