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Bash functions to list and kill or send signals to process trees

Posted 03-31-2012 at 11:54 PM by konsolebox
Updated 06-14-2015 at 08:54 AM by konsolebox

These functions can be used in scripts or interactive shells to manipulate process trees. At least bash version 3.0 is needed. May also work with some earlier versions.

kill_tree - Creates a list of processes based from a parent process ID first then sends the signal to all of them synchronously.

kill_tree_2 - Same as killtree but it doesn't create a list first. It immediately kills processes as it goes through every level.

kill_tree_3 - This version kills child processes first before the parent.

kill_children, kill_children_2, kill_children_3 - These functions are similar to the killtree functions except that the first parent process is not killed.

list_tree - Creates a list of process IDs in a process tree.
list_children - Also creates a list of process IDs in a process tree but excludes the first parent process.

Code:
# kill_tree (pid, [signal = SIGTERM])
#
# Creates a list of processes first then sends the signal to all of
# them synchronously.
#
function kill_tree {
	local LIST=("$1")
	list_children_ "$1"
	kill -s "${2-SIGTERM}" "${LIST[@]}"
}

# kill_tree_2 (pid, [signal = SIGTERM])
#
# This version kills processes as it goes.
#
function kill_tree_2 {
	local LIST=() S=${2-SIGTERM} A
	IFS=$'\n' read -ra LIST -d '' < <(exec pgrep -P "$1")
	kill -s "$S" "$1"

	for A in "${LIST[@]}"; do
		kill_tree_2 "$A" "$S"
	done
}

# kill_tree_3 (pid, [signal = SIGTERM])
#
# This version kills child processes first before the parent.
#
function kill_tree_3 {
	local LIST=() S=${2-SIGTERM} A
	IFS=$'\n' read -ra LIST -d '' < <(exec pgrep -P "$1")

	for A in "${LIST[@]}"; do
		kill_tree_3 "$A" "$S"
	done

	kill -s "$S" "$1"
}

# kill_children (pid, [signal = SIGTERM])
#
# Creates a list of child processes first then sends the signal to all
# of them synchronously.
#
function kill_children {
	local LIST=()
	list_children_ "$1"
	kill -s "${2-SIGTERM}" "${LIST[@]}"
}

# kill_children_2 (pid, [signal = SIGTERM])
#
# This version kills processes as it goes.
#
function kill_children_2 {
	local LIST=() S=${2-SIGTERM} A
	IFS=$'\n' read -ra LIST -d '' < <(exec pgrep -P "$1")

	for A in "${LIST[@]}"; do
		kill_tree_2 "$A" "$S"
	done
}

# kill_children_3 (pid, [signal = SIGTERM])
#
# This version kills child processes first before the parent.
#
function kill_children_3 {
	local LIST=() S=${2-SIGTERM} A
	IFS=$'\n' read -ra LIST -d '' < <(exec pgrep -P "$1")

	for A in "${LIST[@]}"; do
		kill_tree_3 "$A" "$S"
	done
}

# list_tree (pid)
#
# Saves list of found PIDs to array variable LIST.
#
function list_tree {
	LIST=("$1")
	list_children_ "$1"
}

# list_children (pid)
#
# Saves list of found PIDs to array variable LIST.
#
function list_children {
	LIST=()
	list_children_ "$1"
}

# list_children_ (pid)
#
function list_children_ {
	local ADD=() A
	IFS=$'\n' read -ra ADD -d '' < <(exec pgrep -P "$1")
	LIST+=("${ADD[@]}")

	for A in "${ADD[@]}"; do
		list_children_ "$A"
	done
}
The latest versions of these functions are updated here: https://github.com/konsolebox/script...er/killtree.sh
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