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This article mainly shows you "how to do arithmetic in the Linux terminal", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "how to do arithmetic in the Linux terminal" this article.

1. Use Bash Shell

The first and easiest way to perform basic mathematical operations on Linux CLI is to use double parentheses. Here are some examples of how we use values stored in variables:

$ADD=$ ((1 + 2)) $echo $ADD$ MUL=$ (($ADD * 5)) $echo $MUL$ SUB=$ (($MUL-5)) $echo $SUB$ DIV=$ (($SUB / 2)) $echo $DIV$ MOD=$ (($DIV% 2)) $echo $MOD

Algorithms in Linux Bash Shell

two。 Use the expr command

The expr command evaluates the expression and prints the value of the provided expression to standard output. We'll look at different ways to use expr for simple math, compare, increase the value of a variable, and find the length of a string. Here are some examples of simple calculations using the expr command. Note that many operators need to escape or reference shell, such as the * operator (we'll see more in the comparison of expressions).

$expr 3 + 5$ expr 15% 3$ expr 5\ * 3$ expr 5-3$ expr 20 / 4

The basic algorithm of using expr command in Linux

Next, we will show you how to make a comparison. When the expression evaluates to false, expr prints a value of 0, otherwise it prints 1.

Let's look at some examples:

$expr 5 = 3$ expr 5 = 5$ expr 8! = 5$ expr 8\ > 5$ expr 8\ < 5$ expr 8\

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