Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

While writing a Bourne-compatible startup script you need to make sure that the PID saved in /var/run/legacy.pid still belongs to a running process and that the current user has permission to signal it. The check must not disturb the daemon in any way; you only care about the command's exit status (0 means the process is present and signalable, non-zero means it is not). Which one of the following single-line commands meets this requirement by using the standard kill utility?

  • kill -9 -- $(cat /var/run/legacy.pid)

  • kill -0 $(cat /var/run/legacy.pid)

  • kill -HUP $(cat /var/run/legacy.pid)

  • kill -l $(cat /var/run/legacy.pid)

CompTIA Linux+ XK0-006 (V8)
Services and User Management
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