How do I associate an open port with a running program?
eg: what is listening on port 22?
# lsof -i :22
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
sshd 1318 root 3u IPv4 2444 TCP *:ssh (LISTEN)
sshd 7665 root 4u IPv4 166534123 TCP netbackup:ssh->router:918 (ESTABLISHED)
sshd 19710 root 4u IPv4 554877146 TCP netbackup:ssh->router:853 (ESTABLISHED)
eg: what is listening on port smpt (the mail port)?
# lsof -i :smtp
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
sendmail 25860 root 4u IPv4 66767220 TCP *:smtp (LISTEN)