A cluster of background worker processes all run under the name "webapp". After updating its configuration files, you need to prompt every instance to re-read settings by sending the hangup signal. Which command achieves this goal?
pkill -9 webapp
pkill webapp
kill $(pgrep webapp)
pkill -HUP webapp
Using pkill with the -HUP option targets every process matching the name and sends the SIGHUP (hangup) signal, instructing them to reload configuration. The other options either omit the signal (defaulting to SIGTERM), send a different signal, or use kill without specifying the required signal.
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