Postmaster.pid - what do the various lines stand for?

Hi all, I have the file postmaster.pid - I would like to know
what the lines mean? I did Google, but didn't find much.

======================================
[pol(at)localhost inst]$ more ./data/postmaster.pid
7382
/home/pol/Downloads/software/postgres/inst/./data
1430769205
5432
/tmp
localhost
5432001 2195471
[pol(at)localhost inst]$
=======================================

"inst" is the base install of the PostgreSQL instance.

7382 is the process id of the .../inst/bin/postgres -D ./data process

I'm curious as to what this line
/home/pol/Downloads/software/postgres/inst/./data
means
The PostgreSQL install is in /home/pol/Downloads/software/postgres/inst/, but
what does the bit of the path inst/./data - I'm unclear as to what the . (dot)
in the middle of that path means.

Is the 1430769205 a UNIX epoch time (seconds since 1970) since the
instance started?

5432 is the port (configurable)

/tmp - the PostgreSQL temp (sorting) directory?

localhost is my machine name (never bothered to give it anything meaningful).

It's the last line
5432001 2195471
that really puzzled me - I don't have a clue what they are about.

I'd be grateful for any input on this matter,

TIA and rgs,

Pól Ua Laoínecháin

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