/etc/nethack/nethackrc.x11 is in nethack-x11 3.4.3-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# System-wide NetHack configuration file for X-based NetHack.
#
OPTIONS=windowtype:x11,toptenwin,hilite_pet,!number_pad
OPTIONS=fixinv,safe_pet,sortpack,tombstone,color
OPTIONS=verbose,news,fruit:potato
OPTIONS=dogname:Slinky
OPTIONS=catname:Rex
OPTIONS=pickup_types:$
OPTIONS=nomail
# Enable this if you want to see your inventory sorted in alphabetical
# order by item instead of by index letter:
# OPTIONS=sortloot:full
# or if you just want containers sorted:
# OPTIONS=sortloot:loot
#
# There are 17 object symbols and various graphics symbols.
# The descriptions of these symbols can be found in dat/opthelp.
#
#
# Font: nh10 (10x20)
#
OBJECTS= 180 183 188 192 181 184 182 189 190 196 \
191 194 193 187 185 186 195
#
DUNGEON= 032 025 018 013 012 014 011 015 023 024 \
022 021 128 129 130 131 132 035 035 133 \
134 135 136 137 145 146 144 124 143 142 \
141 140 149 150 031 031 147 148 031 161 \
140
#
TRAPS= 138 138 138 138 138 138 138 138 138 138 \
138 138 138 138 138 139 138 138 138 138 \
138 138
#
EFFECTS= 151 152 153 154 155 156 157 158 \
159 160 161 162 \
163 164 165 166 167 168 169 170 \
171 172 173 174 175 176 177 178 179
#
#
# Font: ibm (8x14)
#
#OBJECTS= 207 210 215 219 208 211 209 216 217 223 \
# 218 221 220 214 212 213 222
#
#DUNGEON= 032 128 129 130 131 132 133 134 135 136 \
# 137 138 139 045 124 142 143 035 035 144 \
# 145 146 147 148 155 156 227 124 154 153 \
# 152 151 159 160 200 200 157 158 250 170 \
# 151
#
#TRAPS= 149 149 149 149 149 149 149 149 149 149 \
# 149 149 149 149 149 150 149 149 149 149 \
# 149 149
#
#EFFECTS= 161 162 163 164 165 166 167 168 \
# 169 170 171 172 \
# 173 174 175 176 177 178 179 180 \
# 181 182 183 184 185 186 187 188 189
#
#
# Font: a "standard" font like 6x13
# Note that this version is unlikely to work on a tty on a Unix system because
# many of these characters are also control characters.
#
#DUNGEON = 032 025 018 013 012 014 011 015 023 024 \
# 022 021 031 045 124 043 043 035 035 031 \
# 035 001 060 062 060 062 019 124 092 035 \
# 123 125 031 125 046 046 035 035 046 127 \
# 125
#
#TRAPS= 094 094 094 094 094 094 094 094 094 094 \
# 094 094 094 094 094 002 094 094 094 094 \
# 094 094
#
#EFFECTS= 124 045 092 047 042 033 041 040 \
# 048 035 064 042 \
# 047 045 092 124 124 092 045 047 \
# 047 064 092 064 064 064 092 064 047
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