[Minecraft, SMP] A really simple shutdown announcement with a five minute warning. I know this approach is very repetitive and could make use of script functions instead. But hey, it works.

mc-stop.sh

#!/bin/bash

MC="/Users/steve/Minecraft"

cmd="say Restarting in 5 minutes."
echo $cmd
bash -c "screen -p 0 -S minecraft -X eval 'stuff \"$cmd\"\015'"
sleep 60

cmd="say Restarting in 4 minutes."
echo $cmd
bash -c "screen -p 0 -S minecraft -X eval 'stuff \"$cmd\"\015'"
sleep 60

cmd="say Restarting in 3 minutes."
echo $cmd
bash -c "screen -p 0 -S minecraft -X eval 'stuff \"$cmd\"\015'"
sleep 60

cmd="say Restarting in 2 minutes."
echo $cmd
bash -c "screen -p 0 -S minecraft -X eval 'stuff \"$cmd\"\015'"
sleep 60

cmd="say Restarting in 1 minute."
echo $cmd
bash -c "screen -p 0 -S minecraft -X eval 'stuff \"$cmd\"\015'"
sleep 60

cmd="say Restarting NOW."
bash -c "screen -p 0 -S minecraft -X eval 'stuff \"$cmd\"\015'"
echo $cmd
sleep 15

screen -p 0 -S minecraft -X eval 'stuff save-all\015'
screen -p 0 -S minecraft -X eval 'stuff stop\015'
sleep 5

mv $MC/server_gc.log $MC/server_gc.log.last

Notice, we save a copy of the last garbage collector log. If you do not enable the GC log, you can remove this line.