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This article mainly introduces the relevant knowledge of arithmetic operators in shell, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this article on arithmetic operators in shell. Let's take a look.

The commonly used arithmetic operators are listed below, assuming that the variable an is 10 and the variable b is 20:

Operator states that the result of example + addition expr $a + $b is 30. -subtract expr $a-$b and the result is-10. * multiply expr $a\ * $b and the result is 200. / divide expr $b / an and the result is 2. % take expr $b $an and the result is 0. Assigning a value to b assigns the value of the variable b to a. = = equal. It is used to compare two numbers, and true is returned if the same number is the same. [B] returns false. ! = not equal. It is used to compare two digits. True is returned if they are different. [B] returns true. Example

Examples of arithmetic operators are as follows:

#! / bin/bash# author: rookie tutorial # url:www.runoob.coma=10b=20val= `expr $a + $b`echo "a + b: $val" val= `expr $a-$b`echo "a-b: $val" val= `expr $a\ * $b`echo "a * b: $val" val= `expr $b / $a`echo "b / a: $val" val= `expr $b% $a`echo "b% a: $val" if [$a = $b] thenecho "an equals b" fiif [$a! = $b] thenecho "an is not equal to b" fi

Execute the script, and the output is as follows:

A + b: 30a-b:-10a * b: 200b / a: 2b% a: 0a is not equal to b Note: the multiplication sign (*) must be preceded by a backslash (\) to achieve multiplication; if...then...fi is a conditional statement, which will be explained later. The expr syntax for shell in MAC is: $((expression)), where the "*" in the expression does not need to escape the symbol "\". This is the end of the article on "what are the arithmetic operators in shell?" Thank you for reading! I believe you all have a certain understanding of the knowledge of "what are the arithmetic operators in shell". If you want to learn more, you are welcome to follow the industry information channel.

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