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  • You are asking several questions, which are technically unrelated (related only by the fact that you happen to need the answer for the same program): How to ask the user for input, how to write a loop based on a certain condition, and how to exclude a file name from a path (3 questions). In this case you should create three threads in this forum, one for each question. Also, I can't help wondering to what extend you were reading the bash man-page before asking this. Also, for the question of reading user input, you can use this well known website. Commented Sep 11, 2017 at 6:50
  • For the mkdir part, see if dirname is what you are looking for: dirname path/to/entry.a.b.c returns path/to. Commented Sep 11, 2017 at 9:03