On 2/26/21 9:29 AM, Georgi K. wrote:
My installation of grep thinks [a-Z] is a valid range, while [A-z] is not.
That's because 'a' collates before 'Z' in your locale, but 'A' does not collate before 'z'. If that's not what you want you can change your locale, e.g., by setting LC_ALL="C" in your environment.