How can I create every folder (A-Z) in Alphabet with the help of a shell script in Linux?

I want to have the following folder structure (for illustration):


and so on.


Simple brace expansion:

mkdir -p /mnt/ext_hdd/{A..Z}

If you want all possible combinations, you could of course do {A..Z}{A..Z} and so on. If you want to test it, add an echo before the whole command.

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