irc command

Connect

connect to a server
/connect irc_server_name

disconnects server
/disconnect irc_server_name

Channel

join to a channel
/j #channelname


leave channel
/wc
or
/part

Chat room

list windows
/window list

show user in channel
/who

set status in channel
/me waves hello

private chat with user
/msg user1 hello

change nickname
/nick user_2

Admin

login
/oper

Permissions

Gives channel ops to a user
/op user1

Removes channel ops from a user
/deop user1

Channel

set channel topic/topic Welcome to my channel

sets up a channel password
/mode #channel +k secret_password

Help

show help
/help

Hide join part messages

/ignore #channel MODES JOINS PARTS QUITS NICKS

or

/ignore -channels #channel1,#channel2,#channel3 * JOINS PARTS QUITS

no ignore
/unignore #channel MODES JOINS PARTS QUITS NICKS

Reference :
#Beginner - IRC Commands, the Basics
irc channel administration - Public: Concord Software Projects - Confluence
freenode: using the network