#!/bin/sh -
#
#   Oliver Fromme  <olli@fromme.com>
#
#   BSD-style copyright and standard disclaimer applies.
#
#   Prints recursively all children processes of a given PID,
#   including the given PID itself.  If no PID is specified,
#   it starts at your shell's PID.  Output is not sorted.
#
#   Note:  If a process has been "daemonized" or otherwise
#   detached from its parent process, then its parent process
#   is init (PID 1), and this script will not find it.
#

Usage()
{
	echo "Usage:  ${0##*/} [pid]" >&2
	exit 1
}

if [ $# -lt 1 ]; then
	set -- `ps -lp $$ | awk '!/PID/{print $3}'`
else
	for i in "$@"; do
		case "$i" in
			""|*[!0-9]*)	Usage ;;
		esac
	done
fi

ps -alx | awk '

	function f(s, _a) {
		split(s, _a)
		for(i in _a) {
			print _a[i]
			f(c[_a[i]])
		}
	}

	{
		if ($2 != $3)
			c[$3] = c[$3] " " $2
	}

	END {
		f("'"$*"'")
	}
'

#--