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Looking at the thread title, we are going of topic...
So reading again #1

Normal if you are not root... many files are only readonly for that user
find -name "rog*.*" should really be:
find ...

OK I see we could have some misunderstanding: I suggest you document yourself on special files, file descriptors, and what I mentionned above related to named pipes... In order to understand what I...

There is nothing stopping you creating file descriptors and use them afterwards
like
[some program] -options -args >&6 # as I need the output to use as input for &4 that.....