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This article mainly introduces "how to use the Linux echo command". In the daily operation, I believe many people have doubts about how to use the Linux echo command. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about how to use the Linux echo command. Next, please follow the editor to study!

The Linux common command echo is used to print the value of the shell variable in shell, or to output a specified string directly.

Echo outputs the specified string or variable

Add that the echo command of linux is very commonly used in shell programming, and it is also often used when printing variable value under the terminal, so it is necessary to understand the usage of echo. The function of echo command is to display a section of text on the display, which generally plays the role of a prompt.

Syntax echo (option) (parameter) option-e: activates escape characters. When using the-e option, if the following characters appear in the string, they are specially treated instead of being output as normal text:

\ a sound of warning

\ b Delete the previous character

\ c No further output (characters that follow\ c will not be output)

\ f Wrap line, but the cursor remains in its original position

\ nWrap and the cursor moves to the beginning of the line

\ r move the cursor to the beginning of the line, but do not wrap

\ t insert tab

\ v is the same as\ f

\ insert\ character

\ nnn inserts ASCII characters represented by nnn (octal)

Parameter variable: specifies the variable to print.

The instance uses the echo command to print colored text:

Text color:

Echo-e "\ e [1x 31mThis is red text\ e [0m" This is red text\ e [1x 31m set the color to red

\ e [0m reset the color back

Color code: reset = 0, black = 30, red = 31, green = 32, yellow = 33, blue = 34, magenta = 35, cyan = 36, white = 37

Background color:

Echo-e "\ e [1x 42mGreed Background\ e [0m" Greed Background color code: reset = 0, black = 40, red = 41, green = 42, yellow = 43, blue = 44, magenta = 45, cyan = 46, white = 47

Text flashes:

There are other numeric parameters in the red number: 0 turn off all properties, 1 set high brightness (bold), 4 underline, 5 flash, 7 inverse display, 8 blanking.

At this point, the study of "how to use the Linux echo command" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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