Channels can have additional constraints, which can be set by the MODE command, (most of the information in this section can also be obtained by issuing "/HELP MODE"). To understand this, recall that the first person to JOIN a channel effectively creates it and is initially "in charge" of the channel, ("Channel Operator" or "chanop"). S/he can subsequently add those constraints, make other people chanops at leisure.
Table 7: Mode commands
-----------------------
Keyword Action
~~~~~~~ ~~~~~~
MODE changes channel or user mode
Public is the default mode for a channel. When someone is on a public channel, he can be seen by all other users, (if his own user mode permits this). Anyone can notice users on a public channel and join such a conversation.
Private means that, although anyone can see members of such a channel, you can't tell what channel they are on unless you are already on that channel with them. They just appear as "Prv: *" in LIST or NAMES. Since the number of potential channels is in the billions, this is quite some security - all you give away is the acknowledgement that you're IRCing.
If you are on a secret channel, someone who is not on the same channel can't even see that you are there. Your name does not show up in a LIST of active users. The only indication of your presence is that, when entering IRC, all new users are told that there are "NNNNN users on XXX servers". If someone checks on all users and finds less than NNNNN of them, he knows that other people are hiding on secret channels. But a secret channel user still cannot be found except by brute-force checking through all channels, a hopeless proposition in the face of the huge number of possible channel names. Security through obscurity finally means something.
/MODE
Allows channel operators to change channel mode, or any user to change their personal mode, (don't use this co mmand too often, it floods the net with worthless information).
/MODE #Twilight_Zone +m
*** Mode change "+m" on channel #Twilight_Zone by Nap
/MODE Nap -i
*** Mode change "-i" for user Nap by poly.polytechnique.fr
And this is how to give 'chanop' status to someone on the channel
/MODE #Twilight_Zone +o sojge
*** Mode change "+o sojge" on channel #Twilight_Zone by Nap
A + or - sign determines whether the mode should be added or deleted. Try typing "/HELP MODE" to get further information. Channels can be moderated (only chanops can talk), secret, private, with a limited number of users, anonymous, invite-only, topic-limited, with a list of banned users.
The MODE command also allows you to modify your personal parameters, your "user mode". You can check your usermode with the command "/MODE
Table 8: Channel modes
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ModeChar Effects on channels
~~~~~~~~ ~~~~~~~~~~~~~~~~~~~
b
i channel is invite-only
l
m channel is moderated, (only chanops can talk)
n external /MSGs to channel are not allowed
o
p channel is private
s channel is secret
t topic limited, only chanops may change it
Table 9: User modes
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ModeChar Effects on nicknames
~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~
i makes yourself invisible to anybody that does
not know the exact spelling of your nickname
o IRC-operator status, can only be set
by IRC-ops with OPER
s receive server notices
w receive wallops (abused and deprecated)
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