Battle.net chat commands:

The following commands can be used in any chat channel. For Starcraft players, they can also be used during game setup or while a game is in progress.

/whois [user] - (E.G. /whois AdamM) - Looks up some basic information on a user, including their account number and their current location. This is an excellent way to find your friends online. You can also search for an account number by typing /whois #[number] (E.G. /whois #1).
Aliases for this command: /who /whereis

/whisper [user] - (E.G. /whisper PatN or /whisper #6) - Sends a private message to a user online regardless of the channel they are in. This is an excellent way to let a friend know you are online.
Aliases for this command: /w /msg

/squelch [user] - (E.G. /squelch Andrewe or /squelch #2) - Ignores any future messages from that user effectively muting that user to you.
Aliases for this command: /ignore

/unsquelch [user] - (E.G. /unsquelch Andrewe or /unsquelch #2) - Allows a previously squelched user to talk to you normally.
Aliases for this command: /unignore

/away [text] - (E.G. /away eating dinner) - Displays a messages that you are away from your keyboard whenever someone whispers to you or does a /whois command on you.

/who [channel] - (E.G. /who Town Square) - Displays a list of all users in the given channel.

/users - Displays the number of users currently on Battle.net.

/time - Displays the current Battle.net time.

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The following commands can only be used while chatting:

/channel [channel name] - (E.G. /channel bar) – Switches to a channel without having to use the channel join screen.

/me [text] - (E.G. /me is rolling on the floor laughing!) - Displays emotion text, as in "PatN is rolling on the floor laughing!" This command currently works only in Starcraft.

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The following commands can only be used by channel operators (the person with the gavel):

/designate [user] - (E.G. /designate Alenl or /designate #42) - Selects [user] as the next channel operator when you step down, either by resigning or by leaving the channel.

/resign - Step down as channel operator and become a normal user again.

/kick [user] - (E.G. /kick TwainM or /kick #23) - Kicks a user out of the channel. This is best used as a warning since a kicked user can return at their leisure.

/ban [user] - (E.G. /ban RobertB or /ban #13) - Kicks a user out of the channel and prevents them from returning until the current operator steps down or leaves the channel. This is the most powerful command at an operator's disposal, use it wisely.

/unban [users] - (E.G. /unban RobertB or /unban #13) - Allows a banned user to return to the channel.