See the following example:

$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 2226205
$ wmctrl -lp | grep 'Google Chrome'
0x00400020 0 1458872 X10DAi-00 New Tab - Google Chrome

What's the relationship between 2226205 and 1458872? Is it possible to find the PID of the application, i.e., 1458872, launched by proxychains-ng based on the background proxychains-ng PID, i.e., 2226205?

Regards,
HY

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

In article <32c46650-de8a-4c4d-9a84-0bfdf31e979fn@googlegroups.com>, hongy...@gmail.com <hongyi.zhao@gmail.com> wrote:

See the following example:

$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 2226205
$ wmctrl -lp | grep 'Google Chrome'
0x00400020 0 1458872 X10DAi-00 New Tab - Google Chrome

What's the relationship between 2226205 and 1458872? Is it possible
to find the PID of the application, i.e., 1458872, launched by
proxychains-ng based on the background proxychains-ng PID, i.e., 2226205?

I use the following shell function in my scripts:

# usage: childpid=$(getpid <parentPid> <program2search4>)
getpid() {
pstree -p $1 | gawk 'NF > 1 { print $2+0 }' FS="-($2)[(]"
}

The idea is that you could just use "pidof" (or "pgrep" or whatever), but
that searches globally - i.e., searches all the processes on the system.
What you want is a version of "pidof" that only searches the children of a given process ID. The above function does that.

P.S. Doncha just love these new 7_or_8-digit-PIDs? The system I'm typing
on now recently upgraded to using them. Crazy, man!

--
Never, ever, ever forget that "Both sides do it" is strictly a Republican meme.

It is always the side that sucks that insists on saying "Well, you suck, too".

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 12.09.2021 15:17, hongy...@gmail.com wrote:

See the following example:

$ proxychains-ng-http google-chrome >/dev/null 2>&1 & [1] 2226205 $
wmctrl -lp | grep 'Google Chrome' 0x00400020 0 1458872 X10DAi-00 New
Tab - Google Chrome

What's the relationship between 2226205 and 1458872? Is it possible
to find the PID of the application, i.e., 1458872, launched by
proxychains-ng based on the background proxychains-ng PID, i.e.,
2226205?

If you are effectively asking whether you can find the parent of a
process given the PIDs then yes, that's possible by using ps(1).

$ ps -o ppid,pid
PPID PID
22673 14283
22488 22673


Janis

Regards, HY

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 12.09.2021 15:36, Kenny McCormack wrote:

In article <32c46650-de8a-4c4d-9a84-0bfdf31e979fn@googlegroups.com>, hongy...@gmail.com <hongyi.zhao@gmail.com> wrote:

See the following example:

$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 2226205
$ wmctrl -lp | grep 'Google Chrome'
0x00400020 0 1458872 X10DAi-00 New Tab - Google Chrome

What's the relationship between 2226205 and 1458872? Is it possible
to find the PID of the application, i.e., 1458872, launched by
proxychains-ng based on the background proxychains-ng PID, i.e., 2226205?

I use the following shell function in my scripts:

# usage: childpid=$(getpid <parentPid> <program2search4>)
getpid() {
pstree -p $1 | gawk 'NF > 1 { print $2+0 }' FS="-($2)[(]"
}

The idea is that you could just use "pidof" (or "pgrep" or whatever), but that searches globally - i.e., searches all the processes on the system.
What you want is a version of "pidof" that only searches the children of a given process ID. The above function does that.

What's the advantage of the complex pstree-based function compared to
just using ps(1) ?

$ ps h --ppid 22575 -o pid
1764
31254


Janis

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

In article <shl07u$1amq$1@gioia.aioe.org>,
Janis Papanagnou <janis_papanagnou@hotmail.com> wrote:
...

What's the advantage of the complex pstree-based function compared to
just using ps(1) ?

$ ps h --ppid 22575 -o pid
1764
31254

A couple of things come to mind:

1) I think you and I read OP's requirements differently. So, we (you & I)
seem to be solving different problems. Of course, only time will tell
which of us (if any) read it correctly.

2) ps is a mess. It has become such a joke over the years, trying to
support every possible version that's ever been written, that I try to
avoid it. I had no idea that any of the options you list above even
existed (and I've been using Unix and ps for far too long...)

--
You are a dreadful man, Kenny, for all your ways are the ways of death.
- Rick C Hodgin -

(P.S. -> https://www.youtube.com/watch?v=sMmTkKz60W8)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 12.09.2021 16:11, Kenny McCormack wrote:

In article <shl07u$1amq$1@gioia.aioe.org>,
Janis Papanagnou <janis_papanagnou@hotmail.com> wrote:
...

What's the advantage of the complex pstree-based function compared to
just using ps(1) ?

$ ps h --ppid 22575 -o pid
1764
31254

A couple of things come to mind:

1) I think you and I read OP's requirements differently. So, we (you & I) seem to be solving different problems. Of course, only time will tell
which of us (if any) read it correctly.

I don't think so (but may be wrong). In my first post I just formulated
it as seen from the children ("what is a process's parent" instead of
"what are the children of a process"), because I think it's closer to
the understanding that for every Unix process the parent can be directly identified. And ps(1) connects both from whichever perspective you want
to see it.

2) ps is a mess. It has become such a joke over the years, trying to
support every possible version that's ever been written, that I try to
avoid it. I had no idea that any of the options you list above even
existed (and I've been using Unix and ps for far too long...)

While ps was always a mess - I agree here - meanwhile they incorporated
options from any variant plus maybe new ones and --long-option-versions.
True. For the large Linux community this means in consequence that you
find whatever you want! The very useful -o to define only those fields
that you actually want stems from AIX and is so useful that you see
similar behaving options now in other commands as well. The dash-less
'h' is an old style one (that can be found in commands with an older
history), here mixed with the dash-form options and the long-forms;
there's often options available that suppress the output data header.
That there's a --ppid (at least in Linux' ps version) I just suspected
and indeed found it in the man page. Otherwise I would have resorted
instead of
ps h --ppid 22575 -o pid
to the still very clear
ps -o ppid,pid | awk '$1==22575 {print $2}'

Actually I think that with the "specify desired output" -o option and
the "define what you are refering to" --ppid option it supports very
clean interfaces without ballast. Just imagine the (even greater) mess
in former times where every platform has its own incompatible version.
Now you have it all in one at least and need not resort to other tools
in most cases.

Where we indeed prefer different approaches is that I avoid parsing
graphical tools (like pstree) when tools are available that provide
easier parseable tabular data.

Janis

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sunday, September 12, 2021 at 9:44:35 PM UTC+8, Janis Papanagnou wrote:

On 12.09.2021 15:36, Kenny McCormack wrote:

In article <32c46650-de8a-4c4d...@googlegroups.com>,
hongy...@gmail.com <hongy...@gmail.com> wrote:

See the following example:

$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 2226205
$ wmctrl -lp | grep 'Google Chrome'
0x00400020 0 1458872 X10DAi-00 New Tab - Google Chrome

What's the relationship between 2226205 and 1458872? Is it possible
to find the PID of the application, i.e., 1458872, launched by
proxychains-ng based on the background proxychains-ng PID, i.e., 2226205?

I use the following shell function in my scripts:

# usage: childpid=$(getpid <parentPid> <program2search4>)
getpid() {
pstree -p $1 | gawk 'NF > 1 { print $2+0 }' FS="-($2)[(]"
}

The idea is that you could just use "pidof" (or "pgrep" or whatever), but that searches globally - i.e., searches all the processes on the system. What you want is a version of "pidof" that only searches the children of a given process ID. The above function does that.

What's the advantage of the complex pstree-based function compared to
just using ps(1) ?

$ ps h --ppid 22575 -o pid
1764
31254

The wrapper script ``proxychains-ng-http'':

#!/usr/bin/env bash
proxychains_conf=/path/to/proxychains-ng-http.conf
if type -fp proxychains4 >/dev/null; then
exec proxychains4 -q -f $proxychains_conf "$@"
fi


The testing:

werner@X10DAi-00:~$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 4069773
0x00400031 0 3657396 X10DAi-00 New Tab - Google Chrome
werner@X10DAi-00:~$ wmctrl -lp |grep -i 'chrome'
0x00400031 0 3657396 X10DAi-00 New Tab - Google Chrome
werner@X10DAi-00:~$ ps h --ppid 4069773 -o pid
werner@X10DAi-00:~$

HY

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, September 13, 2021 at 8:55:16 AM UTC+8, hongy...@gmail.com wrote:

On Sunday, September 12, 2021 at 9:44:35 PM UTC+8, Janis Papanagnou wrote:

On 12.09.2021 15:36, Kenny McCormack wrote:

In article <32c46650-de8a-4c4d...@googlegroups.com>,
hongy...@gmail.com <hongy...@gmail.com> wrote:

See the following example:

$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 2226205
$ wmctrl -lp | grep 'Google Chrome'
0x00400020 0 1458872 X10DAi-00 New Tab - Google Chrome

What's the relationship between 2226205 and 1458872? Is it possible
to find the PID of the application, i.e., 1458872, launched by
proxychains-ng based on the background proxychains-ng PID, i.e., 2226205?

I use the following shell function in my scripts:

# usage: childpid=$(getpid <parentPid> <program2search4>)
getpid() {
pstree -p $1 | gawk 'NF > 1 { print $2+0 }' FS="-($2)[(]"
}

The idea is that you could just use "pidof" (or "pgrep" or whatever), but that searches globally - i.e., searches all the processes on the system. What you want is a version of "pidof" that only searches the children of a
given process ID. The above function does that.

What's the advantage of the complex pstree-based function compared to
just using ps(1) ?

$ ps h --ppid 22575 -o pid
1764
31254

The wrapper script ``proxychains-ng-http'':

#!/usr/bin/env bash
proxychains_conf=/path/to/proxychains-ng-http.conf
if type -fp proxychains4 >/dev/null; then
exec proxychains4 -q -f $proxychains_conf "$@"
fi

The testing:

werner@X10DAi-00:~$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[1] 4069773
0x00400031 0 3657396 X10DAi-00 New Tab - Google Chrome
werner@X10DAi-00:~$ wmctrl -lp |grep -i 'chrome'
0x00400031 0 3657396 X10DAi-00 New Tab - Google Chrome
werner@X10DAi-00:~$ ps h --ppid 4069773 -o pid
werner@X10DAi-00:~$

Got it. If there is already a Chrome session, it will be shared instead of creating a new session from scratch:

$ pkill chrome
$ proxychains-ng-http google-chrome >/dev/null 2>&1 &
[2] 1097863
$ wmctrl -lp |grep -i 'chrome'
0x02000003 0 1097863 X10DAi-00 New Tab - Google Chrome

HY

--- SoupGate-Win32 v1.05
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