There is a section of this Guidebook that discusses that.
.pg
The default name of the configuration file varies on different
-operating systems, but NETHACKOPTIONS can also be set to
-the full name of a file you want to use (possibly preceded by an `@').
+operating systems. On DOS and Windows, it is ``defaults.nh''
+in the same folder as nethack.exe or nethackW.exe. On Unix, linux
+and Mac OS X it is ``.nethackrc'' in the user's home directory.
+NETHACKOPTIONS can also be set to the full name of a file you
+want to use (possibly preceded by an `@').
+.pg
+Here is a short example of config file contents:
+.sd
+\fB# Set your character's role, race, gender, and alignment.\fP
+\fBOPTIONS=role:Valkyrie, race:Human, gender:female, align:lawful\fP
+
+\fB# Turn on autopickup, and set automatically picked up object types\fP
+\fBOPTIONS=autopickup,pickup_types:$"=/!?+\fP
+\fB# Show colored text if possible\fP
+\fBOPTIONS=color\fP
+\fB# Show lit corridors differently\fP
+\fBOPTIONS=lit_corridor\fP
+
+\fB# No startup splash screen. Windows GUI only.\fP
+\fBOPTIONS=!splash_screen\fP
+.ed
.hn 2
Customization options
.pg
%.pg
The default name of the configuration file varies on different
-operating systems, but NETHACKOPTIONS can also be set to
-the full name of a file you want to use (possibly preceded by an `{\tt @}').
+operating systems. On DOS and Windows, it is ``{\tt defaults.nh}''
+in the same folder as nethack.exe or nethackW.exe. On Unix, linux
+and Mac OS X it is ``{\tt.nethackrc}'' in the user's home directory.
+NETHACKOPTIONS can also be set to the full name of a file you
+want to use (possibly preceded by an `{\tt @}').
+
+%.pg
+Here is a short example of config file contents:
+%.sd
+\begin{verbatim}
+ # Set your character's role, race, gender, and alignment.
+ OPTIONS=role:Valkyrie, race:Human, gender:female, align:lawful
+
+ # Turn on autopickup, and set automatically picked up object types
+ OPTIONS=autopickup,pickup_types:$"=/!?+
+ # Show colored text if possible
+ OPTIONS=color
+ # Show lit corridors differently
+ OPTIONS=lit_corridor
+
+ # No startup splash screen. Windows GUI only.
+ OPTIONS=!splash_screen
+\end{verbatim}
+%.ed
%.hn 2
\subsection*{Customization options}