/usr/share/ircd-ratbox/help/opers/umode is in ircd-ratbox 3.0.7.dfsg-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 20 21 22 23 24 25 26 27 28 | MODE <nick> <+|-><modes>
Usermodes: (* designates that the umode is oper only)
USERMODE DESCRIPTION
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+i - Designates this client 'invisible'.
+g - "caller id" mode only allow accept clients to message you
+o - Designates this client is an IRC Operator.
Use the /oper command to attain this.
* +a - Is marked as a server admin in whois.
* +b - Can see possible bot warnings.
* +c - Can see client connections and exits.
* +C - Can see extended client connections and exits.
* +d - Can see server debug messages.
* +f - Can see 'I-line is full' notices.
* +k - Can see server kill messages.
* +l - Can see oper locops (local wallops).
* +n - Can see client nick changes.
* +r - Can see 'rejected' client notices.
* +s - Can see generic server messages and oper kills.
* +u - Can see unauthorised client connections.
* +w - Can see server wallops.
* +x - Can see new server introduction and split messages.
* +y - Can see stats/links/admin requests to name a few.
* +z - Can see oper wallops.
* +Z - Can see operspy notices
+D - Deaf - ignores all channel messages.
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