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Top Forums UNIX for Dummies Questions & Answers Command to find parent and child process? Post 302515874 by newbie_01 on Thursday 21st of April 2011 05:45:06 AM
Old 04-21-2011
Command to find parent and child process?

Hi,

I have a script that calls other scripts/commands which may or may not spawn other process.

From my understanding, when I do a ps -ef, the highest numbered process ID is supposed to be the parent ID of all the other related child processes, is this correct?

In most or all circumstances, I do a ps -ef | grep <processid> of my script and anything that spawns off that process IDs I assumed are the child processes of my script. If I want to terminate my script and all other child processes, then I kill the parent ID which is the highest numbered PID and this will subsequently kill all other child process IDs, is this correct?

Now, my question is whether there is any quick way of showing what are the child processes of a parent ID instead of what am currently doing now which is visually checking which one is the parent ID and "assuming" that the highest numbered PID is the parent ID of all the other processes.

Below is a sample output of running ps -ef | grep exp | grep -v grep. I assume from the output below that the parent process/ID is PID 11322, is that correct?

Any advice or suggestion will be much appreciated. Thanks in advance.

Code:
oracle   11154 11153  0 21:20 ?        00:00:00 /bin/sh -c (. ~oracle/.profile; /bin/ksh /usr/local/oracle/scripts/expdp_o
oracle   11155 11154  0 21:20 ?        00:00:00 /bin/sh -c (. ~oracle/.profile; /bin/ksh /usr/local/oracle/scripts/expdp_o
oracle   11190 11155  0 21:20 ?        00:00:00 /bin/ksh /usr/local/oracle/scripts/expdp_schema.ksh dev01
oracle   11322 11190  0 21:20 ?        00:00:00 expdp

 

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ptree(1)																  ptree(1)

NAME
ptree - print process trees SYNOPSIS
/usr/bin/ptree [-a] [-c] [-z zone] [pid | user] ... ptree prints the process trees containing the specified pids or users, with child processes indented from their respective parent pro- cesses. An argument of all digits is taken to be a process-id, otherwise it is assumed to be a user login name. The default is all pro- cesses. The following options are supported: -a All. Print all processes, including children of process 0. -c Contracts. Print process contract memberships in addition to parent-child relationships. See process(4). This option implies the -a option. -z zone Zones. Print only processes in the specified zone. Each zone ID can be specified as either a zone name or a numerical zone ID. This option is only useful when executed in the global zone. The following operands are supported: pid Process-id or a list of process-ids. ptree also accepts /proc/nnn as a process-id, so the shell expansion /proc/* can be used to specify all processes in the system. user Username or list of usernames. Processes whose effective user IDs match those given are displayed. Example 1: Using ptree The following example prints the process tree (including children of process 0) for processes which match the command name ssh: $ ptree -a `pgrep ssh` 1 /sbin/init 100909 /usr/lib/ssh/sshd 569150 /usr/lib/ssh/sshd 569157 /usr/lib/ssh/sshd 569159 -ksh 569171 bash 569173 /bin/ksh 569193 bash The following exit values are returned: 0 Successful operation. non-zero An error has occurred. /proc/* process files See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ The human readable output is Unstable. The options are Evolving. gcore(1), ldd(1), pargs(1), pgrep(1), pkill(1), plimit(1), pmap(1), preap(1), proc(1), ps(1), ppgsz(1), pwd(1), rlogin(1), time(1), truss(1), wait(1), fcntl(2), fstat(2), setuid(2), dlopen(3C), signal.h(3HEAD), core(4), proc(4), process(4), attributes(5), zones(5) 11 Oct 2005 ptree(1)
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