Cl chatmode

Name: cl_chatmode
Default value: "2"
Flags:

Console chat mode.
0 = Text in the console is always treated as a command and in order to chat you have to use messagemode/messagemode2 or use the say/say_team commands.
1 = Everything you type in the console goes into chat, in order to issue a command, prefix it with a slash (/).
2 = If the first word in the line is a command, it is executed, otherwise the line is sent as chat.