This is a Complete list of console commands in Left 4 Dead. This is up to date to November 21, 2008.
This page was considerably large. They have been split according to the alphabet to shorten the list of console commands. There are a total of 2736 commands.
NOTE: While this is a complete list of console commands as printed by the Left 4 Dead developer console, it may be missing some commands that are hidden (will not print nor show when typing in the console); for example: respawn, wait, and spectate.
NOTE: While the values for all of these should be correct, when printing the cvar list from the console, it does not print any numbers past a decimal place, so 0.25 would become 0; the reason for this is not currently known. There are many values to go through, so use your intuition. If it seems like it should be a decimal, then it might actually be, and if you're really not sure, you can double check by typing the value into the console itself as decimals to appear.