Linux查看进程id，以及根据进程id查看占用的端口，根据端口号查看占用的进程

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1. 先根据进程名查看进程id

ps aux | grep 进程名(或者ps -ef | grep 进程名)

y@ubuntu:~$ ps aux | grep bitcoind
y          2708  101 12.1 1611172 488580 ?      Ssl  Aug22  32:04 bitcoind -daemon -connect=172.16.247.139
y          3564  0.0  0.0  21536  1092 pts/0    S+   00:23   0:00 grep --color=auto bitcoind

可以看到，bitcoind进程的pid是2708

2.通过进程id查看占用的端口

netstat -nap | grep 进程id

y@ubuntu:~$ netstat -nap | grep 2708
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 127.0.0.1:8332          0.0.0.0:*               LISTEN      2708/bitcoind       
tcp6       0      0 ::1:8332                :::*                    LISTEN      2708/bitcoind 

可以看到，pid=2708的进程占用的端口号是8332

3.通过端口号查看占用的进程id

netstat -nap | grep 端口号

y@ubuntu:~$ netstat -nap | grep 8332
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 127.0.0.1:8332          0.0.0.0:*               LISTEN      2708/bitcoind       
tcp6       0      0 ::1:8332                :::*                    LISTEN      2708/bitcoind  

可以看到，占用8332端口的是进程的pid是2708，名称是bitcoind