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1. Suppose I know just the process id of a process, I want to know how can I get the process owner.
2. I know if I run a script I can know the process id by print $$ and get its parent using getppid function. But If I want to know the grandparent and its parent and so on i.e the whole process tree backwards, how can I achieve that ?
I believe I was not very clear with my question. Actually I am looking for any builtin functions within perl or linux or any cpan module which will give me this information.
You are right that I can run ps command and then parse it using awk to get the process owner and parent process id and can continue it like that way to get the whole tree backwards but I found this process a bit time consuming.
Also pstree will give the process tree out of that process id, here I want the tree backwards not forward.
Any information on a perl builtin or a capn module which can give me the process owner name given the process id would be very useful.