A systemd unit must invoke a shell script once the daemon’s main process exits and its shutdown sequence has finished. Which [Service] directive specifies this script?
ExecStartPre=/usr/local/bin/cleanup.sh
ExecReload=/usr/local/bin/cleanup.sh
ExecStartPost=/usr/local/bin/cleanup.sh
ExecStopPost=/usr/local/bin/cleanup.sh
The ExecStopPost directive is executed after systemd has terminated the main process and completed the shutdown sequence, making it the appropriate choice for cleanup. ExecStartPre runs before the daemon starts, ExecStartPost executes immediately after startup, and ExecReload applies only when reloading the service.
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