Configuration Information [Automatically generated, do not change]: Machine: x86_64 OS: linux-gnu Compiler: gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall uname output: Linux laptop 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Machine Type: x86_64-pc-linux-gnu
Bash Version: 4.3 Patch Level: 11 Release Status: release Description: In the enclosed example ( based on http://unix.stackexchange.com/questions/303166/doesnt-work-the-bash-script-to-check-given-single-character-is-in-lower-case-or ), bash always echos Lowercase, whereas all dash, zsh, and ksh echo Lowecase/Uppercase pairs as expected. Repeat-By: uplow: read d case $d in [a-z]) echo "Character is in Lowercase";; [A-Z]) echo "Character is in Uppercase";; esac test: for sh in bash dash ksh zsh; do echo $sh; $sh uplow <<<x; $sh uplow<<<X ; echo ; done