[ale] shell script to find a script's ancestors

[Björn Gustafsson]

On 8/2/06, David Corbin <dcorbin at machturtle.com> wrote:
> Since I cannot find out who is installing iptables when my ppp interface
> starts, I thought I might replace it with a shell script to log who it's
> parent is.
>
> Anyone care to suggest the best way to show the current process's ancestors
> from a shell script?

You can get a single-level parent from a bash script in one line:

#!/bin/bash
echo $PPID

To get the whole ancestral tree, a simple perl script works for me:

#!/usr/bin/perl
my $proc = $$;
while ($proc > 1) {
        my $procinfo = `ps -fp $proc`;
        print $procinfo;
        my @proctext = split(/\s+/,$procinfo);
        $proc = $proctext[10]; # your `ps' may vary.
}