GPT on Question 14, Sep 30

I'm writing a bash script to purge orphaned children after the parent dies. What's the idiomatic way?

A dead Bash process cannot clean up afterward. The usual approach is to track children and use traps for normal exit and catchable signals:

#!/usr/bin/env bash

children=()

cleanup() {
    status=$?
    trap - EXIT INT TERM HUP

    if ((${#children[@]})); then
        kill -TERM -- "${children[@]}" 2>/dev/null || :
        sleep 0.2
        kill -KILL -- "${children[@]}" 2>/dev/null || :
        wait "${children[@]}" 2>/dev/null || :
    fi

    exit "$status"
}

trap cleanup EXIT
trap 'exit 130' INT
trap 'exit 143' TERM
trap 'exit 129' HUP

command1 &
children+=("$!")

command2 &
children+=("$!")

wait

Notes:

•Explicit PID tracking is safer than pkill -P $$.
•Avoid the common kill 0 idiom unless the script owns its process group; otherwise it may kill its caller or unrelated processes.
•This kills only direct children. If children spawn descendants, run each workload in its own process group/session and kill the group, or preferably use a supervisor/cgroup.
•No Bash trap runs for SIGKILL, power loss, or some crashes. If cleanup must be guaranteed after abrupt death, use facilities such as a systemd service with KillMode=control-group, a container/cgroup, or Linux parent-death signals (PR_SET_PDEATHSIG) implemented by the child/helper.

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Model: openai/gpt-5.6-sol
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Date: 2026-09-30 · run 20260930T090007Z-45ce12 · scorer v1
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A dead Bash process cannot clean up afterward. The usual approach is to track children and use traps for normal exit and catchable signals:
```bash
#!/usr/bin/env bash
children=()
cleanup() {
    status=$?
    trap - EXIT INT TERM HUP
    if ((${#children[@]})); then
        kill -TERM -- "${children[@]}" 2>/dev/null || :
        sleep 0.2
        kill -KILL -- "${children[@]}" 2>/dev/null || :
        wait "${children[@]}" 2>/dev/null || :
    fi
    exit "$status"
}
trap cleanup EXIT
trap 'exit 130' INT
trap 'exit 143' TERM
trap 'exit 129' HUP
command1 &
children+=("$!")
command2 &
children+=("$!")
wait
```
Notes:
- Explicit PID tracking is safer than `pkill -P $$`.
- Avoid the common `kill 0` idiom unless the script owns its process group; otherwise it may kill its caller or unrelated processes.
- This kills only direct children. If children spawn descendants, run each workload in its own process group/session and kill the group, or preferably use a supervisor/cgroup.
- No Bash trap runs for `SIGKILL`, power loss, or some crashes. If cleanup must be guaranteed after abrupt death, use facilities such as a systemd service with `KillMode=control-group`, a container/cgroup, or Linux parent-death signals (`PR_SET_PDEATHSIG`) implemented by the child/helper.

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