问题 So I've got the following files in the tmp directory: file.0 file.1 file.t9 file.22 file.4444 if I wanted to list only the files that end in '.digits' (0, 1, 22, 4444) but not (t9) I could try and use wildcards such as this: ls tmp/file.{[0-9],[0-9][0-9],[0-9][0-9][0-9],[0-9][0-9][0-9][0-9]} however I get the following results with the ugly error ls: cannot access tmp/file.[0-9][0-9][0-9][0-9]: No such file or directory file.0 file.1 file.22 file.4444 I've also tried using {0..999} but that