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Full Discussion: How to easily identify socket given a PID on Linux?
Operating Systems Linux How to easily identify socket given a PID on Linux? Post 302995477 by mohtashims on Thursday 6th of April 2017 05:41:25 AM
Old 04-06-2017
Quote:
Originally Posted by drysdalk
Hi,

Ah, you want to check the listening sockets in that case. That's not what you're doing here. You're looking at all established sockets - in other words, connections between your system and another system.

For listening sockets, the netstat syntax you want is netstat -lnpt, and not netstat -anpt (and of course you don't want to be doing a grep ESTABLISHED either). That will show you just the sockets that are open and listening for incoming connections on your local system.

Hope this helps !
This is better but can you tell me how can i extract the ip and port as the output varies from Process to process.

For PID=32538 below is what i get as an ouput

Code:
bash-3.2$ netstat -lnpt | grep 32538
(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 0.0.0.0:7666                0.0.0.0:*                   LISTEN      32538/java
tcp        0      0 ::ffff:10.2.228.79:13804    :::*                        LISTEN      32538/java
tcp        0      0 :::38970                    :::*                        LISTEN      32538/java

First Question: Out of the listings above how can i grep for just the ip and port i.e. in this case 10.2.228.79 & 13804 which is the correct ip port we specified in the configuration. I wish i could ignore the other listings in the output above.

Second question: will fd be a better alternative ? if yes, can you tell me how can i get the listen ip & port from fd command?
 

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LEARN ABOUT CENTOS

grub-file

GRUB-FILE(1)                                                       User Commands                                                      GRUB-FILE(1)

NAME

       grub-file - check file type

SYNOPSIS

       file OPTIONS FILE

DESCRIPTION

       Check if FILE is of specified type.

       --is-i386-xen-pae-domu
              Check if FILE can be booted as i386 PAE Xen unprivileged guest kernel

       --is-x86_64-xen-domu
              Check if FILE can be booted as x86_64 Xen unprivileged guest kernel

       --is-x86-xen-dom0
              Check if FILE can be used as Xen x86 privileged guest kernel

       --is-x86-multiboot
              Check if FILE can be used as x86 multiboot kernel

       --is-x86-multiboot2 Check if FILE can be used as x86 multiboot2 kernel

       --is-arm-linux
              Check if FILE is ARM Linux

       --is-arm64-linux
              Check if FILE is ARM64 Linux

       --is-ia64-linux
              Check if FILE is IA64 Linux

       --is-mips-linux
              Check if FILE is MIPS Linux

       --is-mipsel-linux
              Check if FILE is MIPSEL Linux

       --is-sparc64-linux
              Check if FILE is SPARC64 Linux

       --is-powerpc-linux
              Check if FILE is POWERPC Linux

       --is-x86-linux
              Check if FILE is x86 Linux

       --is-x86-linux32
              Check if FILE is x86 Linux supporting 32-bit protocol

       --is-x86-kfreebsd
              Check if FILE is x86 kFreeBSD

       --is-i386-kfreebsd
              Check if FILE is i386 kFreeBSD

       --is-x86_64-kfreebsd
              Check if FILE is x86_64 kFreeBSD

       --is-x86-knetbsd
              Check if FILE is x86 kNetBSD

       --is-i386-knetbsd
              Check if FILE is i386 kNetBSD

       --is-x86_64-knetbsd Check if FILE is x86_64 kNetBSD

       --is-i386-efi
              Check if FILE is i386 EFI file

       --is-x86_64-efi
              Check if FILE is x86_64 EFI file

       --is-ia64-efi
              Check if FILE is IA64 EFI file

       --is-arm64-efi
              Check if FILE is ARM64 EFI file

       --is-arm-efi
              Check if FILE is ARM EFI file

       --is-hibernated-hiberfil
              Check if FILE is hiberfil.sys in hibernated state

       --is-x86_64-xnu
              Check if FILE is x86_64 XNU (Mac OS X kernel)

       --is-i386-xnu
              Check if FILE is i386 XNU (Mac OS X kernel)

       --is-xnu-hibr
              Check if FILE is XNU (Mac OS X kernel) hibernated image

       --is-x86-bios-bootsector
              Check if FILE is BIOS bootsector

       -h, --help              Display this help and exit.  -u, --usage             Display the usage of this command and exit.

SEE ALSO

       The  full documentation for grub-file is maintained as a Texinfo manual.  If the info and grub-file programs are properly installed at your
       site, the command

              info grub-file

       should give you access to the complete manual.

grub-file (GRUB) 2.02-2ubuntu8.3                                     July 2018                                                        GRUB-FILE(1)
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