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This article introduces the knowledge of "how to use shell script programming to achieve 9x9 multiplication table". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Script content

The code is as follows:

#! / bin/bash

For i in "1", "2", "3", "4", "5", "6", "7", "8"9"

Do

For j in "1", "2", "3", "4", "5", "6", "7", "8"9"

Do

If [${j}-lt ${I}]

Then

Kwon $((I * j))

Echo-n ${I} * ${j} = ${k} $'\ t'

Fi

If [${j}-eq ${I}]

Then

Kwon $((I * j))

Echo ${I} * ${j} = ${k}

Fi

Done

Done

Output result

The code is as follows:

[iufo@iufo test] $bash. / test.sh

1-1-1

2, 1, 2, 2, 2, 4.

3'1'3 3'2'6 3'3'9

4 "1" 4 4 "2" 8 4 "3" 12 4 "4" 16

5'1'5 5'2'10 5'3'15 5'4'20 5'5 25

6 "1" 6 6 "2" 12 6 "3" 18 6 "4" 24 6 "5" 30 6 "6" 36

7 "7" 7 "2" 14 7 "3" 21 7 "4" 28 7 "5" 35 7 "6" 42 7 "7" 49

8'8'2'16 8'3'24 8'4 32 8'5'40 8'6'48 8'7'56 8'8'64

9-9-9-2-18-9-3-27-9-4-36-9-45-9-6-54-9-7-63-9-8-72-9-9-81

[iufo@iufo test] $

Summarize the knowledge points

1. For cycle

The code is as follows:

For v_1 in [list]

Do

Done

If list is "1-2-3", then the vsl value is an array 1-2-3.

If you want to assign only one value to vroom1 at a time, you need to write separately, that is, "1", "2", "3".

2. Arithmetic operation in bash

The code is as follows:

Kwon $((I * j))

There can be no spaces around the equal sign, and there are no spaces for assignment.

In addition, the arithmetic operation needs to be enclosed with $(), which means that the operation is carried out first and the result is calculated. Operators add, subtract, multiply and divide with spaces on both sides.

3. The use of echo command

Echo, output the characters after echo.

The default output is followed by a newline character.

The-n argument cancels the newline character at the end.

The-e parameter enables the escape character to take effect. The escape character is "\", and the commonly used escape characters are\\ t\ n

For example:

The code is as follows:

Echo-e 1\\ T2

Echo-ne 1\ n2

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