jack-watcher

#!/bin/bash


POLL_FREQUENCY=1	# attempt to poll this frequently (in seconds)
SCRIPT_NAME=$(basename $0)


# Ensure only THIS instance of the script is running
for pid in $(pidof -xo $$ $SCRIPT_NAME 2>/dev/null); do
	other_pids+=" $(pstree -Apl $pid | sed -r 's/[^)]*\(//g; s/\)/ /g' | xargs echo)"
done
[[ $other_pids ]] && kill $other_pids &>/dev/null

while true; do
	checksum=$(md5sum /proc/asound/card0/codec#0)
	if [[ $checksum != $checksum_old ]]; then
		toggle-headphones
		checksum_old=$checksum
	fi
	sleep $POLL_FREQUENCY
done