This category contains articles about the various options which may be set either in the .nethackrc file or by pressing [O] in-game. An option with no dedicated article is probably documented in the Option article.
“The game options affect the look and feel of the game. There are two types of options, boolean...Options
“AUTOPICKUP_EXCEPTION is a configuration option that allows you to define what items are...Autopickup exception
“Autopickup is an option, on by default, that specifies that your character automatically picks...Autopickup
“NetHack checks a number of environment variables. Some are useful for anyone, some are just for...Environment variable