Tail logs of all Docker containers bash script

tail-docker-containers.bash

#!/bin/bash
set -e -u -o pipefail

function usage() {
	local name
	name=$(basename "$0")
	echo "$name: tail Docker container logs" 1>&2
	echo "Usage: $name [-h]" 1>&2
	echo "	-h Show help" 1>&2
	echo "Example: $name" 1>&2
}

while getopts "h" arg; do
	case $arg in
	h|*) # Show help
		usage
		exit 1
	;;
	esac
done


TMPDIR=$(mktemp -d)
# PIDS array contains process id's to kill after this scripts is interrupted by signal INT/QUIT/TERM
PIDS=()
function cleanup() {
	trap "" SIGINT SIGQUIT SIGTERM
	for pid in "${PIDS[@]}"; do
		if ! kill $pid; then
			echo "$(basename $0): kill error with pid: $pid" 1>&2
		fi
	done
	rm -rf $TMPDIR
}
function sigint_handler() {
	cleanup
	exit 130
}
function sigquit_handler() {
	cleanup
	exit 131
}
function sigterm_handler() {
	cleanup
	exit 143
}
trap sigint_handler INT
trap sigquit_handler QUIT
trap sigterm_handler TERM
for id in $(docker ps --format="{{.Names}}" -a); do
	log=$TMPDIR/$id.log
	touch "$log"
	docker logs -f "$id" 1> "$log" 2>&1 &
	PIDS+=($!)
done
tail -f $TMPDIR/*.{log,err} &
PIDS+=($!)
wait