Is there a way to display the history of all processes using some shell command? I want to prove that when I run my script, that it is executed in a different process.
Help is appreciated!

No process history, but a script can display its process ID, and that of its parent's.  In the example below, my shell process is 5493. The first execution of myscript runs in its own new shell, but the 2nd execution was preceded by a dot, and you can see that execution runs in the current 5493 shell, which is how you run a script when you want it to impact the current shell.

ps
PID TTY       TIME COMMAND
5964 pts/tb    0:00 ps
5492 pts/tb    0:00 telnetd
5493 pts/tb    0:00 sh

cat myscript
echo "Me: $$   Parent: $PPID"

myscript
Me: 6817   Parent: 5493

. myscript
Me: 5493   Parent: 5492

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include
echo "I am $$, my parent is $PPID"
ps -eaf|egrep "$$|$PPID"|egrep -v "ps |grep "

Hi, thank you for the replies. I also remembered that I can just put 'ps' im my script and it will display the process even after it is finished.