Show main PID only

bash

systemctl show -p MainPID nginx

Explanation

Extract the tracked main PID for a unit.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

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Show status, recent logs, and the service main PID.

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Print the unit file and drop-ins defining a service.

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List active services managed by systemd.

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Read recent logs associated with one systemd unit.

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Filter the journal by process ID.

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Signal only the service main process.

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