find UID terminal name/PID/PPID

Linux_Kidd · 03-02-2017, 07:05 PM

what the easiest way to find the PPID's of terminal PID's for active line users?

i am able to awk a who -a for the lines that are "+" to get the active line PID's, from there i can ps -o ppid to find the PPID, and finally find that parent in ps.

but is there a easier way?

r3sistance · 03-02-2017, 07:17 PM

I don't think you have phrased this question right, it sounds like you are after the PID and PPID of the current terminal, this may change by shell but in BASH the following should work.

Code:

# echo "PID: "$$", PPID: "$PPID
PID: 32538, PPID: 32537

and to confirm

Code:

# ps -o ppid,pid,cmd
 PPID   PID CMD
32538   318 ps -o ppid,pid,cmd
32537 32538 -bash

Linux_Kidd · 03-03-2017, 04:06 PM

i want the process name that started the line PID of all active lines, etc.
in other words, the PPID name of active line PID

as example, my ssh session is pts/0
the line has PID 1220, and a PPID 1216, ps 1216 is a SSHD fork "sshd: root@pts/0"
1216 PPID is /usr/sbin/sshd, and its PPID is 1 (init)

but, i yank active lines with

Code:

who -a | awk '$2 == "+" {print $7;}'

i am looking for a more elegant way, etc.

Linux_Kidd · 03-20-2017, 03:04 PM

bump, just seeking one last time.
anyone have a better way?

rtmistler · 03-20-2017, 03:21 PM

There's a better suggestion using scripting in the answer provided by user hadarot on 8/29/2005 in the following link:

http://www.unix.com/shell-programmin...-pid-only.html

Honestly for me, I'm a C programmer and thus I use getpid() and getppid(), http://man7.org/linux/man-pages/man2/getpid.2.html

Note also that in the /proc subsystem for any given process, this information exists within the file structure.