used PASSWORD to authorize server connection (must be first command from client to server) example:

PASS mypassword

responses:

• ERR_NEEDMOREPARAMS

change or create user nickname to USERNAME if user with current nickname exist in server - ERR_NICKCOLLISION thrown prefix OLDNICK can be used to change other user nickname

example:

NICK mynewnick

:oldnick NICK newnick

responses:

• ERR_NONICKNAMEGIVEN
• ERR_ERRONEUSNICKNAME
• ERR_NICKNAMEINUSE
• ERR_NICKCOLLISION

command used to authenticate user in server database (must be second command from client to server after command PASS)

example:

USER guest tolmoon tolsun :Ronnie Reagan

responses:

• ERR_NEEDMOREPARAMS
• ERR_ALREADYREGISTRED

make current user irc operator, LOGIN and PASSWORD are required to gain privileges

example:

OPER login password

responses:

• ERR_NEEDMOREPARAMS
• RPL_YOUREOPER
• ERR_NOOPERHOST
• ERR_PASSWDMISMATCH

command to end client session, server closes connection with client after this message. If MESSAGE is not given - nickname will be used

example:

QUIT :Gone to have lunch

responses:

None

join to channels named by comas using keys (if provided), if channel is not exist - creates channel and makes current user operator of new channel

example:

JOIN #ch1

JOIN &ch2 password2, #ch3 password3

:user JOIN #channel

responses

• ERR_NEEDMOREPARAMS
• ERR_BANNEDFROMCHAN
• ERR_INVITEONLYCHAN
• ERR_BADCHANNELKEY
• ERR_CHANNELISFULL
• ERR_BADCHANMASK
• ERR_NOSUCHCHANNEL
• ERR_TOOMANYCHANNELS
• RPL_TOPIC

leave current user from listed channels

example:

PART #ch1, &ch2

responses:

• ERR_NEEDMOREPARAMS
• ERR_NOSUCHCHANNEL
• ERR_NOTONCHANNEL

command changes topic of channel CHANNEL to NEWTOPIC or get channel topic if no arguments provided

example:

TOPIC #ch1

TOPIC &ch2 :new better topic

:user TOPIC #ch1

responses:

• ERR_NEEDMOREPARAMS
• ERR_NOTONCHANNEL
• RPL_NOTOPIC
• RPL_TOPIC
• ERR_CHANOPRIVSNEEDED

command list all visible (not private (+p), or secret (+s)) nicknames from listed channels, if no arguments provided - returned information about all online users. If user online and not in channel - his channel name is *

example:

NAMES #ch1

NAMES

responses:

• RPL_NAMREPLY
• RPL_ENDOFNAMES

command list channels and their topics, if no arguments provided - listed all channels. Private channels are listed without their topics as channel Prv unless current client is not in this private channel, secret channels are not listed at all, unless current client is not in this secret channel

example:

LIST #ch1

LIST

• ERR_NOSUCHSERVER
• RPL_LISTSTART
• RPL_LIST
• RPL_LISTEND

command invite users to channel, that the channel CHANNEL should exist, if channel CHANNEL is invite only (mode +i), current user should be operator of channel CHANNEL

example:

INVITE myfriend #ch1

:user INVITE another #ch1

responses:

• ERR_NEEDMOREPARAMS
• ERR_NOSUCHNICK
• ERR_NOTONCHANNEL
• ERR_USERONCHANNEL
• ERR_CHANOPRIVSNEEDED
• RPL_INVITING
• RPL_AWAY

kick user USERNAME from channel #CHANNEL and if specified send him message REASON, command available only for operators, user USERNAME can join channel CHANNEL again (command KICK is forced command PART)

send private message MESSAGE to user USERNAME

send message REASON to user USERNAME and breaks connection with him, user USERNAME can login again