The version number of Bash: GNU bash, version 4.4.11(1)-release
The hardware and operating system: x86_64-pc-linux-gnu, Debian GNU/Linux 9 A description of the bug behaviour: When the nocaseglob option is set, the [:upper:] class in pattern does not match capital or small letters. On the other hand, [:lower:] works fine. A short script or ‘recipe’ which exercises the bug and may be used to reproduce it: $ touch a A $ echo [[:upper:]] A $ shopt -s nocaseglob $ echo [[:lower:]] a A $ echo [[:upper:]] [[:upper:]]
