How to create and password protect a zip file on macOS

在 Finder 介面沒似乎沒有這樣的功能，所以從指令列建立有密碼保護的壓縮檔案：

$ zip -er YOUR_FILENAME.zip FILES_or_FOLDERS

參考下面範例壓縮及解壓縮：

% zip -er Diamond_Sutra.zip Diamond_Sutra.epub
Enter password:
Verify password:
adding: Diamond_Sutra.epub (deflated 0%)

% rm Diamond_Sutra.epub

% unzip Diamond_Sutra.zip
Archive: Diamond_Sutra.zip
[Diamond_Sutra.zip] Diamond_Sutra.epub password:
inflating: Diamond_Sutra.epub