[admantis]

I don't know what is /color (red,green,yellow...), however maybe you mean this.. as example, using strcmp to compare the params.

pawn Код:

CMD:color( playerid, params[] )
{
    new s_Color[32];
    if ( sscanf( params, "s[32]", s_Color ) ) return SendClientMessage( playerid, -1, "Usage: /color (green, red, yellow, blue)" );
    if ( strcmp ( s_Color, "green", true ) == 0 )
    {
        SendClientMessage( playerid, -1, "you choosed GREEN");
    }
    if ( strcmp ( s_Color, "red", true ) == 0 )
    {
        SendClientMessage( playerid, -1, "you choosed RED");
    }
    if ( strcmp ( s_Color, "yellow", true ) == 0 )
    {
        SendClientMessage( playerid, -1, "you choosed YELLOW");
    }
    if ( strcmp ( s_Color, "blue", true ) == 0 )
    {
        SendClientMessage( playerid, -1, "you choosed BLUE");
    }
    else // if it's none of above
    {
        SendClientMessage( playerid, -1, "you didn't choose a correct color."); 
    }
    return 1;
}

if this is not your intent, specify yourself