Korn Shell 運算符

本教程列出了所有Korn Shell中的運算符。在這裏，大部分的運算符都是我們熟知的C語言編程很相似。

運算符優先級遞減的順序如下列出：

算術和邏輯運算符：

運算符

描述

Unary plus

Unary minus

Logical negation; binary inversion (one's complement)

Multiply

Divide

Modulo

Add

Subtract

Left shift

Right shift

String comparison for equality

String comparison for non equality

Pattern matching

Bitwise "and"

Bitwise "exclusive or"

Bitwise "inclusive or"

Logical "and"

Logical "or"

Increment

Decrement

Assignment

有以下運算符測試可用在Unix文件中的相關聯各種屬性。

運算符

描述

-r file

Checks if file is readable if yes then condition becomes true.

-w file

Check if file is writable if yes then condition becomes true.

-x file

Check if file is execute if yes then condition becomes true.

-f file

Check if file is an ordinary file as opposed to a directory or special file if yes then condition becomes true.

-s file

Check if file has size greater than 0 if yes then condition becomes true.

-d file

Check if file is a directory if yes then condition becomes true.

-e file

Check if file exists. Is true even if file is a directory but exists.