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Just one more addition to this issue:
- In my system the header for the WIFEXITED and WEXITSTATUS is:
#include <sys/wait.h>
not the 'stdlib.h'

Wow!
Thank you, guis, it is new for me, never come across of that WIFEXITED.
Sure, I should check the man for system().

Big thanks for expalanation!!

I think, I am not clear enough.
Corona688 - I do not have a problem with the perl-script. The error is found and corrected.
I need to be sure that any perl-script problem (script could be changed)...

I am using a perl-script from C-code, executing it by the 'system(..)' comand.

The problem is to return the perl-return code to the C correctly.

Default the 'system()' shell is Bourne: sh
...