Ruby3.x FileTestRuby 3 系 のFileTestに関する言語リファレンス情報をまとめたカテゴリです。function の一覧blockdev?chardev?directory?empty?executable?executable_real?exist?file?grpowned?identical?owned?pipe?readable?readable_real?setgid?setuid?sizesize?socket?sticky?symlink?world_readable?world_writable?writable?writable_real?zero?