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I killed a process by process ID accidentally, but now I need to know the process name.I checked the id number under folder /proc,but I got anything. how can I know the process name please.

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    there's no way to find it. – Ipor Sircer Nov 8 '17 at 23:27
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    there may be logs, assuming the process in question was writing it's pid to a logfile somewhere somehow. probably not, though – thrig Nov 8 '17 at 23:42
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There is no standard mechanism in Linux to discover the name of a deleted process.

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While there is no map of every pid used or log of all of them any logs to journald contain a pid so if it was a daemon you can check for it with:

sudo journalctl _PID=[PID]

note that this only checks logs for the current boot.

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