bash: manage background tasks and terminate them all on Ctrl+C
Run multiple background tasks in bash and gather every task exit code:
declare -A process
declare -A result
for host in $hosts; do
ssh -o ConnectTimeout=10 "$host" /bin/task &
process["$host"]=$!
done
# Get results
for host in $hosts; do
wait ${process["$host"]}
result["$host"]=$?
[ ${result["$host"]} -eq 0 ] && echo "OK: $host" || echo "ERROR: $host"
done
Yes, you can use associative arrays in bash >= 4.0.
Terminate all background tasks if main script was interrupted by Ctrl+C:
function term_all_processes() {
echo "Sending SIGTERM to all background jobs..."
for proc in $(jobs -lp); do
echo "PID $proc"
kill -15 $proc
done
exit 1
}
trap term_all_processes SIGINT
Bash has trap built-in that allows to create custom handlers for recieved signals. Ctrl+C actually is terminal escape sequence that generates SIGINT.
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