Hiding chat messages?

[Gsterman]

What I was thinking of is like
I make a script that when I type !hi it puts "hello" in the chat(not actually what it does but it'll work)
I want to make it so that when I type "!hi", itll still put "hello" into the chat but the "!hi" wont show up.
Kind of confusing but thats pretty much what I wanted.

[Ad Bot]

[Zeblote]

client or server sided

[Gsterman]

client or server sided

client

[Ipquarx]

You can execute a line after an if statement (with no brackets) ONLY as long as it's one line (one command/one statement).

To clarify this in more correct terms:
If you do not put any braces after an if statement, only one statement (up to the next ;) will be executed as part of the if statement.