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@SYNTAX:mode@
Common channel modes are:
i - Invite only - People can't join to channel without being
/INVITEd, or being in invite list (+I, see below).
m - Moderated - People who don't have voices (+v) can't send
messages to channel
p - Private - People who aren't joined to channel can't see it
for example with /WHOISing people who are in channel.
s - Secret - Like private, but the channel isn't displayed in
/LIST's output.
n - No external msgs - Without this mode, anyone can send messages
to channel without even being joined.
t - Topic can be changed only by channel operators.
k <key> - Channel password (aka. key) - The channel can't be joined
without specifying the channel key (see section 6.2).
l <count> - User limit - No more than <count> people can join to
channel. This can be overridden with /INVITE with some
servers.
This is usually used for protecting channel from join
flooding, like some bot allows max. 5 users to join in
one minute or so.
b - Set/remove ban. For example MODE #channel +b *!*@*.org bans
everyone from .org domain.
If someone from .org domain was already in channel before the
ban was set, he/she cannot send any messages to channel (doesn't
work with all servers).
Bans can also be overridden with /INVITE, although many stupid
IRC clients automatically kick the user out because they see
the ban and think that because of it the user shouldn't be in
the channel (doesn't work with all servers).
e - Ban exceptions. You could for example ban everyone from
*!*@*.org but set ban exception to *!*@*.host.org - does not work
with all servers.
I - Invite list. If channel is invite only (+i), people in this
list can join it without being /INVITEd - does not work with all
servers.
This is excellent for in-country channels that don't want
foreigners (spammers!) to join the channel, for example setting
channel's mode to +i and +I *!*@*.fi allows only finnish people
to join the channel. In addition to this, there's usually a bot
in the channels and sending /MSG bot invite command to it
/INVITEs you to the channel.
On IRCnet, the ':' feature in channel names can also be used for
a similar effect, see section 6.2.
o <nick> - Grant or revoke channel operator status from nick
v <nick> - Grant or revoke voice status from nick, only people with
+v (or +o) can talk to channel when it's moderated (+m).
You can send multiple mode changes with one mode command:
/MODE #channel +nto-o+v nick1 nick2 nick3
This would set channel's mode to +nt, give ops to nick1, take ops
from nick2 and give voices to nick3.
You can set only a limited number of modes that require an argument
in one command. In IRCnet it's 3, in EFnet it's 4 and in many others
it's 6. If it's not known, Irssi defaults to 3. Irssi will also
automatically split them, so you can use /MODE +oooooo n1 n2 ...
command to op 6 people and Irssi will split it to two commands in
IRCnet/EFnet.
Many networks have additional modes and/or change the meaning of existing
modes. Check the documentation for the network or the server software in
use for details.
See also: OP, DEOP, VOICE, DEVOICE, BAN, UNBAN
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