/usr/share/doc/atheme/VERSION_LETTERS is in atheme-services 7.2.9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | Letters in version responses
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Version replies (from /version or ctcp version) contain a sequence
of letters like FljR. Their meaning is as follows:
A - ASCII casemapping is used
a - external authentication is used
c - an encryption module is loaded
d - debug logging is enabled
e - nick/account registration requires email verification
F - flood checking is enabled
l - leave_chans is enabled
j - join_chans is enabled
t - changets is enabled (shown as of 2.1)
R - RFC1459 casemapping is used
r - operserv raw can be used
n - services is attached to a terminal
T - services is tainted (running an unsupported configuration)
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