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Thank you for you quick reply, your advice worked.

I understand what you mean about the children of the children (i.e. the sleep processes) not getting the signal. I tried the following:
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I have reformulated my original question in the form of 3 new small sh scripts to illustrate exactly what I am struggling with, w.r.t parent/child process behavior:

Consider a "parent" process:
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Hi steadyonabix,

Thanks for your quick reply! I think the "./" works when you make the scripts executable. What I did, was to make each file "parent" and "child" executable with chmod, i.e.

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Good day,

I am trying to add signal handling capabilities to some of my scripts. Unfortunately, I am having some difficulty with the manner in which signals are propagated between parent/child...