Signal KILL (9) is last resort and should be used as such. A process killed that way has no chance to clean up resources (e.g. flush buffers, close filehandles).

Signals 1, 2, 3 or 15 should be used, an 9 only when the process is still running after those.

In reply to Re^2: start and kill a process in a local shell by shmem
in thread start and kill a process in a local shell by danmcb

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