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I gave brief explanations as comments in the code.
The following are comprehensive ones:

while condition - do - done
is a loop. The condition is the read command that reads a line from the...

You can store the filename in a variable and construct the other filename from it.
In case it finds more than one filename use a for loop or while loop:
#!/bin/bash
while true
do
sleep 2400
#...

If you have a process that generates repeated core dumps, you have a problem. On production systems you want to see no core dumps.

A process that dumps core may leave a data set in an...

Deleting core files will not affect the current running application.
It has crashed (in the past) and generated a core dump.
Or killed intentionally to generate one by user or kernel.

Now, the...

The PostMan web site has the answers to all your questions except the last one. Please read the basics there, Thanks.

Regarding curl, someone who uses curl can help you. Frankly, I stopped...

If your bottleneck is the many fork()s then it helps to replace
-exec ls -ld {} \;with
-exec ls -ld {} +The + bundles the arguments and forks/execs few ls with the maximum number of arguments.

Yes, du is recursive, and in combination with the recursive find there are lots of repeated du runs.
Give other processes priority over du:
nice du -s /dcs/data/08/*/ | sort -n

I would guess that you want something more like:
du -s /dcs/data/08/*/ | sort -rn
It will still be high on the list of output from top while it is running, but at least it will just be processing...

Look into the output files, and you'll see.