LinuxMint(Ubuntu Ver) 查看进程端口号及运行的程序

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ubuntu下如何查看程序占用端口号

# netstat -atunp | more
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      1363/cupsd
tcp        0      0 192.168.189.128:58887   91.189.88.45:80         ESTABLISHED 2121/http
tcp6       0      0 ::1:631                 :::*                    LISTEN      1363/cupsd
udp        0      0 0.0.0.0:68              0.0.0.0:*                           803/dhclient
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           782/avahi-daemon:
r
udp        0      0 0.0.0.0:51352           0.0.0.0:*                           782/avahi-daemon:
r

如何根据端口号来查看进程号
# lsof -i:631
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
cupsd 1363 root 5u IPv6 6338 0t0 TCP localhost:ipp (LISTEN)

cupsd 1363 root 6u IPv4 6339 0t0 TCP localhost:ipp (LISTEN)