apt-get install lsof

netstat -lp

netstat -pl | grep ssh


 lsof -i:22

ss -lp | grep ssh

lsof -c ssh

lsof -p 14332

lsof /dev/loop0

lsof -U

lsof -i

lsof -n -i -P

lsof -i @another-chris-server.tld

lsof -i @another-chris-server.tld::5228-6502

lsof -d 111,34,67

lsof -i -a -u chris

lsof /etc/*

lsof +D /var/log
lsof +d /usr/local

lsof -t /var/log/auth.log

lsof -i tcp
lsof -i udp

lsof -u ^daemon

lsof -r5 -c avahi-daemon -a -i UDP

apt-get install debian-goodies

aptitude update
aptitude full-upgrade -y

checkrestart

service ssh restart

checkrestart -p