In the current situation, a certain script 'calling.sh' launches another script 'called.sh' in the background, performs other operations, sleeps for a while, and then terminates 'called.sh' with a
pkill called.sh. This works fine.
Then, I would also like to launch 'called.sh' from other terminals as a standalone script at any other time, whether before or after launching calling.sh. These independent instances should not be killed by 'calling.sh'.
How can I achieve this? Intuition says that the calling script should be able to tell the process it started from any other namesakes that are running in the meantime.
As a variant, 'calling.sh' may also launch 'called' which is a symbolic link to 'called.sh'. Does this complicate managing the above situation? Which specific cautions and adjustments does using a symbolic link require?