This file is indexed.

/etc/at.deny is in at 3.1.14-1ubuntu1.

This file is owned by root:daemon, with mode 0o640.

The actual contents of the file can be viewed below.

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alias
backup
bin
daemon
ftp
games
gnats
guest
irc
lp
mail
man
nobody
operator
proxy
qmaild
qmaill
qmailp
qmailq
qmailr
qmails
sync
sys
www-data