Unix - Linux Shell Scripting - Case Statement(Switch) - YouTube
Shell Scripting Case - javatpoint
Linux : less cannot search case insensitive using -i - Stack Overflow
3分理解!シェルスクリプトでのcaseの使い方
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nixCraft - Did you know? You can tell the ls or any Linux, macOS/*BSD/Unix command to list files in a case-insensitive manner using bash or zsh: shopt -s nocaseglob # BASH unsetopt
How to Use case .. esac Statements in Bash
bash - ls command: how to ignore case without globbing - Unix & Linux Stack Exchange
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