Run several commands in parallel with `&`, then wait for all of them with `wait`. Collect exit codes via $! and check after wait returns.
Bash
# Fire 3 downloads in parallel
curl -sO https://example.com/a.zip & pid1=$!
curl -sO https://example.com/b.zip & pid2=$!
curl -sO https://example.com/c.zip & pid3=$!
# Wait for all
wait "$pid1" "$pid2" "$pid3"
# Or wait + capture each exit code
declare -A status
for pid in "$pid1" "$pid2" "$pid3"; do
wait "$pid"
status[$pid]=$?
done
for pid in "${!status[@]}"; do
echo "pid $pid exited ${status[$pid]}"
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