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Linux finds port number through OS process PID

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[[email protected] ~]# netstat-tulpnactive Internet connections (only servers) Proto recv-q send-q Local Address Foreign Address State Pid/program name TCP 0 0 127.0.0.1:2208 0.0.0                   .0:* LISTEN 3338/./hpiod TCP 0 0 0.0.0.0:736 0.0.0.0:* LISTEN 3098/rpc.statd TCP 0 0 127.0.0.1:37094 0.0.0.0:* Liste N 4418/ocssd.bin TCP 0 0 0.0.0.0:54955 0.0.0.0:* LISTEN 4919/or A_D000_ORCL TCP 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 3058/portmap t      CP 0 0 0.0.0.0:1521 0.0.0.0:* LISTEN 4974/tnslsnr TCP 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 3358/sshd TCP 0 0 127.0.0.1 : 631 0.0.0.0:* LISTEN 3369/cupsd TCP 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 3404/sendmail TCP 0 0 127.0.0.1:43259 0.0.0.0:* Liste N 4418/ocssd.bin TCP 0 0 127.0.0.1:2207 0.0.0.0:* LISTEN 3343/py Thon UDP 0 0 127.0.0.1:33429 0.0.0.0:* 4418/ocssd.bin u      DP 0 0 127.0.0.1:20633 0.0.0.0:* 4921/ORA_S000_ORCL UDP 0 0 0.0.0.0:21080 0.0.0.0:* 3763/avahi-daemon UDP 0 0 127.0.0.1                 : 13017 0.0.0.0:* 4891/ora_pmon_orcl UDP 0 0 0.0.0.0:730                         0.0.0.0:* 3098/rpc.statd UDP 0 0 0.0.0.0:733 0.0.0.0:*       3098/RPC.STATD UDP 0 0 127.0.0.1:7394 0.0.0.0:* 4418/oc Ssd.bin UDP 0 0 0.0.0.0:5353 0.0.0.0:* 3763/avahi-daemon u      DP 0 0 127.0.0.1:63341 0.0.0.0:* 4418/ocssd.bin UDP 0 0 0.0.0.0:111 0.0.0.0:* 3058/portmap UDP 0 0 0.0.0.0:6             0.0.0.0:* 3369/cupsd UDP 0 0 127.0.0.1:16633                                0.0.0.0:* 4919/ORA_D000_ORCL UDP 0 0 127.0.0.1:61818 0.0.0.0:*       4418/ocssd.bin


The following port numbers are checked against the OS process ID (4974):

[Email protected] ~]# Netstat-nap | grep 4974tcp        0      0 0.0.0.0:1521                0.0.0.0:*                   LISTEN      4974/tnslsnr        tcp        0      0 127.0.0.1:1521              127.0.0.1:11798             established 4974/tnslsnr        UNIX  2      [ACC]     STREAM     LISTENING     15990  4974/tnslsnr        /var/tmp/.oracle/s#4974.1unix  2      [ACC]     STREAM     LISTENING     15992  4974/tnslsnr        /var/tmp/.oracle/s#4974.2unix  3      []         STREAM     CONNECTED     14974  4663/gconfd-2

Linux finds port number through OS process PID

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