[[C]ave[M]an]

Most people suggest ZCMD , because it is easier?

pawn Код:

if( strcmp( cmdtext, "/test", true, 5 ) == 0 )
{
    new id; 
    id = strval( cmdtext );
    return SendClientMessage( id, 0xAAAAAA, "Test" );
}

Basically , you just have to replace "cmdtext" to "params"
like :

pawn Код:

CMD:test( playerid, params[ ] /* Here are the params */ )
{
    new id; 
    id = strval( params ); // So, cmdtext here turns into params. 
    return SendClientMessage( id, 0xAAAAAA, "Test" );
}

thats how easy it is
Credits to https://sampforum.blast.hk/showthread.php?tid=231496