lsof command
when I use the-p and-I instructions together, the output obviously has other processes (it feels like-p doesn"t work)
salamander@salamanderPC:~$ lsof -p 12299 -i4
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ss-qt5 2264 salamander 16u IPv4 35118 0t0 TCP localhost:socks (LISTEN)
ss-qt5 2264 salamander 17u IPv4 35119 0t0 UDP localhost:socks
ss-qt5 2264 salamander 18u IPv4 1474559 0t0 TCP localhost:socks->localhost:53748 (ESTABLISHED)
ss-qt5 2264 salamander 20u IPv4 1477633 0t0 TCP salamanderPC:40712->68.168.140.95.16clouds.com:mysql (ESTABLISHED)
ss-qt5 2264 salamander 23u IPv4 1389384 0t0 TCP localhost:socks->localhost:53542 (ESTABLISHED)
ss-qt5 2264 salamander 26u IPv4 1389390 0t0 TCP salamanderPC:40510->68.168.140.95.16clouds.com:mysql (ESTABLISHED)
ss-qt5 2264 salamander 27u IPv4 1479924 0t0 TCP localhost:socks->localhost:53766 (ESTABLISHED)
ss-qt5 2264 salamander 28u IPv4 1479925 0t0 TCP localhost:socks->localhost:53768 (ESTABLISHED)
ss-qt5 2264 salamander 29u IPv4 1477488 0t0 TCP salamanderPC:40732->68.168.140.95.16clouds.com:mysql (ESTABLISHED)when I only use-p, this is the right time
salamander@salamanderPC:~$ lsof -p 12299
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ssh 12299 salamander cwd DIR 8,2 4096 5505026 /home/salamander
ssh 12299 salamander rtd DIR 8,2 4096 2 /
ssh 12299 salamander txt REG 8,2 727848 6292697 /usr/bin/ssh
ssh 12299 salamander mem REG 8,2 26936 922410 /lib/x86_64-linux-gnu/libnss_dns-2.27.so
ssh 12299 salamander mem REG 8,2 10160 922418 /lib/x86_64-linux-gnu/libnss_mdns4_minimal.so.2
ssh 12299 salamander mem REG 8,2 10281936 6298208 /usr/lib/locale/locale-archive
ssh 12299 salamander mem REG 8,2 47568 922412 /lib/x86_64-linux-gnu/libnss_files-2.27.so
ssh 12299 salamander mem REG 8,2 97176 922406 /lib/x86_64-linux-gnu/libnsl-2.27.so
ssh 12299 salamander mem REG 8,2 47576 922423 /lib/x86_64-linux-gnu/libnss_nis-2.27.so
ssh 12299 salamander mem REG 8,2 39744 922408 /lib/x86_64-linux-gnu/libnss_compat-2.27.so
ssh 12299 salamander mem REG 8,2 14256 922376 /lib/x86_64-linux-gnu/libkeyutils.so.1.5
ssh 12299 salamander mem REG 8,2 144976 922455 /lib/x86_64-linux-gnu/libpthread-2.27.so
ssh 12299 salamander mem REG 8,2 43616 6299972 /usr/lib/x86_64-linux-gnu/libkrb5support.so.0.1
ssh 12299 salamander mem REG 8,2 14248 922331 /lib/x86_64-linux-gnu/libcom_err.so.2.1
ssh 12299 salamander mem REG 8,2 199104 6299964 /usr/lib/x86_64-linux-gnu/libk5crypto.so.3.1
ssh 12299 salamander mem REG 8,2 877056 6299970 /usr/lib/x86_64-linux-gnu/libkrb5.so.3.3
ssh 12299 salamander mem REG 8,2 464824 922444 /lib/x86_64-linux-gnu/libpcre.so.3.13.3
question
what I actually want to see is the tcp connection of a process. In fact, I know that I can filter it again with grep , but I have some doubts about this command. Can"t I use it together?