linux server varia

#iptables
sudo -i
ufw allow from a.b.c.d

#list
sudo iptables -L

#if you mess up things
sudo iptables -L -n

#delete things
sudo iptables -D 10

#kill tcp connections
netstat -a | grep 254
sudo tcpkill host x.y.z.254

#find tomcat port
netstat -ntpl | grep java
tcp        0      0 ::ffff:127.0.0.1:8005       :::*                        LISTEN      11128/java
 ps -ef | grep 11128