This file is indexed.

/usr/share/crawl/dat/defaults/messages.txt is in crawl-common 2:0.13.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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### Highlighting of various messages

msc := message_colour

# Really important messages
#
msc += $danger:drains you
msc += $danger:feel drained
msc += $danger:strangely unstable
msc += $danger:curare-tipped.*hits you
msc += $danger:Space warps.* around you
msc += $danger:Space bends around you
msc += $danger:sense of stasis
msc += $danger:clumsily bash
msc += $danger:goes berserk!
msc += $danger:Forgetting.* will destroy the book
msc += $danger:The blast of calcifying dust hits you!
msc += $danger:you are engulfed in calcifying dust
msc += $danger:is moving more slowly
msc += $danger:^It .* you
msc += $danger:you block its attack
msc += $danger:constricts you
msc += $danger:you convulse
msc += $danger:You feel a build-up of mutagenic energy

msc += $item_dmg:acid corrodes
msc += $item_dmg:catch(es)? fire
msc += $item_dmg:freezes? and shatters?
msc += $item_dmg:covered with spores
msc += $item_dmg:devoured!$
msc += $item_dmg:rots? away

# Less urgent, but still significant messages
#
msc += $warning:ticking.*clock
msc += $warning:dying ticks
msc += $warning:distant snort
msc += $warning:odd grinding sound
msc += $warning:creaking of ancient gears
msc += $warning:floor suddenly vibrates
msc += $warning:a sudden draft
msc += $warning:coins.*counted
msc += $warning:tolling.*bell
msc += $warning:roar of battle
msc += $warning:creaking.*oriflamme
msc += $warning:oriflamme is probably
msc += $warning:wave of frost
msc += $warning:crackling.*melting
msc += $warning:hiss.*sand
msc += $warning:sound.*rushing water
msc += $warning:rusting.*drain
msc += $warning:drain falling apart
msc += $warning:heat about you
msc += $warning:falling.*rocks
msc += $warning:rumble.*avalanche of rocks
msc += $warning:crackle.*arcane power
msc += $warning:crackle.*magical portal
msc += lightcyan:LOW MAGIC WARNING
msc += $warning:fails to return
msc += $warning:no longer ripe

# Unimportant messages and combat clutter
#
msc += $boring:You start (resting|waiting)
msc += $boring:Unknown command
msc += $boring:disappears? in a puff of smoke
msc += $boring:dissolves? into (sparkling lights|shadows)
msc += $boring:crumbles away
#
msc += $boring:plain:miss(es)? (the|you|it)
msc += $boring:but (do no|doesn't do any) damage
msc += $boring:(prevent|prevents) you from hitting
msc += $boring:nimbly evade
msc += $boring:waved at by a branch
msc += $boring:lunges up near

## Messages so important to require a --more--

force_more_message += You have reached level
force_more_message += Your scales start
force_more_message += You fall through a shaft

## Reduce chance of drowning because flight or form runs out:
force_more_message += Careful!

# Announcements of timed portal vaults:
force_more_message += interdimensional caravan
force_more_message += distant snort
force_more_message += roar of battle
force_more_message += wave of frost
force_more_message += hiss of flowing sand
force_more_message += sound of rushing water
force_more_message += oppressive heat about you
force_more_message += crackle of arcane power

# Abyss exits and rune
force_more_message += Found a gateway leading out of the Abyss
force_more_message += Found .* abyssal rune of Zot