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Yes, you are right! I think it was also unclear, but after the examples given latter by Alister its became more or less transparent.
And thank you additionaly for reading my mind! :)

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Thank you very much for good answer!

But I would like to point out two things that are still unclear to me:

1. Actually, I have two ifs or not? I mean when typing
if [[...]]; then
...

I am not an expert of shell scripting, but I can do some simple things. Now, I read a script written by others and I need some help from the experts of this forum.

Please help me to understand...