中文翻譯修改

In the simplest case, a script is nothing more than a list of system commands stored in a file.

`若舉一最簡單的例子，所謂的腳本(script)就是一個由許多系統指令組合而成的單一檔案。`

At the very least, this saves the effort of retyping that particular sequence of commands each time it is invoked.

`至少，在每次需使用一連串特定指令時，它讓使用者省了不少力氣。`