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Is it still a relevant good rule to never use space in a file name?
@hehemrin I mostly avoid them (it makes life at command-line somewhat easier). This is a very interesting article about filename issues in Unix-like systems, I think (spaces are discussed in sec. 6). https://dwheeler.com/essays/fixing-unix-linux-filenames.html
@KarlPettersson Thanks, I'm lazy sometimes, but it is probably better to keep on using eg _ as I have learned to avoid troubles for me (or anyone who will use the file on any OS).
@hehemrin yes_it_is_a_good_rule