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This article mainly introduces "the usage of echo command under linux". In daily operation, I believe many people have doubts about the usage of echo command under linux. 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 "the usage of echo command under linux". Next, please follow the editor to study!

The echo command of linux is very commonly used in shell programming, and it is also often used when printing the variable value under the terminal, so it is necessary to understand the usage of echo.

The function of the echo command is to display a piece of text on the monitor, which generally acts as a prompt.

The general format of the command is: echo [- n] string

The option n means that the output text is not wrapped; the string can be in quotation marks or not. When using the echo command to output the quoted string, the string will be output as is; when using the echo command to output the string without quotation marks, each word in the string will be output as a string, and each string will be separated by a space.

Function description: display text.

Syntax: echo [- ne] [string] or echo [--help] [--version]

Additional note: echo sends the input string to standard output. The output strings are separated by a blank character and a newline number is added to the *.

Parameter:-n do not wrap in *

-e if the following character appears in the string, it will be specially treated instead of being treated as general

Text output:

\ a sound of warning

\ b Delete the previous character

\ c * * without newline symbols

\ 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)

-help display help

-version displays version information

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