BetterPHP

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Getting the location would be possible from the IP, but it would not be that easy. The other things are pretty easy You can use the PLAYER_JOIN event for when people join the server and the PLAYER_QUIT event for when the leave. Then all you need to know how to do is send a message to everyone on the server.

plugin.getServer().broardcastMessage("What you want to say.");

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Well you can get the IP if you have the player which you do from the event

Player player = event.getPlayer();

and then you can use getAddress() which will give you the IP, and the port I think.

Yo get the location you will then need some kind of geolocation database, I have used this one before which seems to work nicely.

For the command

[syntax]/i ITEM-ID AMOUNT[/syntax]
The command is /i and the other bits are arguments, they are stored in the args[] parameter from the onCommand() method.

Oh, to get the list of online players you can do

Player[] players = plugin.getServer().getOnlinePlayers()

so to loop over all players and output the list as a list

for (Player player : plugin.getServer().getOnlinePlayers()){
	plugin.getServer().broadcastMessage(player.getName());
}

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You can disable that somehow, the plugin Essentials does it somehow. Basically, I don't know. But look at the source of a plugin that does it already.

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I don't know really, this page can do IP to country http://www.ip2nation.com/ip2nation but I don't really know how best to do it in Java as a plugin.