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I start monitoring is process alive using tail utility by
tail -Fn0 --pid=11111 /opt/mylogfile.log
Process with PID 11111 was restarted and now this process has other PID 22222 but I still see that tail continue monitoring for process with PID 11111. Could it be a tail issue? Icheck /proc and failed to find /proc/11111. May be tail just hangs?
that is the expected behavior. tail has no any idea about your activity (=you restarted the process). tail will keep doing what was told (monitoring the given pid) until you stop it.
pid is specified by --pid. -F means --follow and --retry. --retry means: keep trying to open a file if it is inaccessible
It is the tail process itself, not the flag which will monitor the given pid and will try it forever (as long as it was not interrupted).
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