Two ways you can identify the PID number of your login shell.
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This does sound like homework. But I will give you a hint. If you ask that same question with Google you will get info on it and can choose what you think is the best. You can also try it and see if it works before you commit to an answer.
Do not expect LQ members to do your homework - you will learn much more by doing it yourself.
LQ Rules does not state we can't help but that it would be better if the person does the work in order to learn.
I personally will direct someone to the potential answer. The OP probably has a text or even lecture notes to reference. Plus a Search here on LQ or <Linux> - Google would provide the answer when proper keywords are used.
@OP Look at 3,8 &9 below. Plus '2' & '7' will have good admin examples.
Just a few links to aid in gaining some understanding;
Wow, you created a whole new account to mask your identity, just to post that gem of wisdom? Shucks.
Actually, for some reason my old ID was not recognized so I reinvented it.
FYI, I can actually learn from a book that tells you the answers if you have a brain sarcastic A**. I could have told you the answer and actually came back on here to be nice to you, but now go >>> **!! The rest of the answer to the question, btw... is on a page later in the book, they reference to that other page in chapter NINE talking about Process ID;s - but go & find that by yourself too!
It is very easy btw... ~shucks~ you can't figure it out? Maybe you should find another career.
Guess it talkes all kinds to make the world turn ....