Final answer:
The amount of damage done by left clicking a knife varies greatly depending on the video game, with left-click attacks typically being quicker but less damaging than alternative attacks.
Step-by-step explanation:
The question about how much dmg (damage) is inflicted by left clicking a knife is most likely related to a video game, where weapons have specific damage outputs. Usually, video game knives have a lower damage rate when using a left-click attack, which is often a quick but less powerful stab, compared to a right-click attack, which might be slower but deals more damage. The exact damage will vary significantly from game to game, and specific numbers should be looked up in the context of the particular game you're asking about, such as Counter-Strike, Fortunate, or any number of other games with melee combat mechanics.