In Mac OS，You may want to view hidden files or file extensions，for file management or troubleshooting。Here's how to show or hide these in Mac OS： Show or hide hidden files 1. 使用快捷键 •打开“访达”（Finder）。 •Press Command + Shift + .(period) key。 •This will toggle showing or hiding hidden files。If hidden files show，You can hide it by pressing the same shortcut key。 2. 通过终端命令 •打开“终端”（Terminal），You can click on the magnifying glass icon on the desktop，Type "terminal" and press Enter to find。 •Enter the following command and press ...