/usr/share/ircd-ratbox/help/users/umode is in ircd-ratbox 3.0.8.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 | MODE <nick> <+|-><modes>
Usermodes:
USERMODE DESCRIPTION
-----------------------------------------------------------------
+o - Designates this client is an IRC Operator.
Use the /oper command to attain this.
+i - Designates this client 'invisible'.
+g - "caller id" mode only allow accept clients to message you
+D - Deaf - ignores all channel messages.
|