Unix - Korn Shell Operators

This tutorial lists down all the operators available in Korn Shell. Here most of the operators are very similar to what we have in C Programming language.
Operators are listed in order of decreasing precedence:

Arithmatic and Logical Operators:

Operator	Description
+	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

File Test Operators:

There are following operators to test various properties associated with a Unix file.

Operator	Description
-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.