Summary of the use of Echo under Linux

First, the use of the echo command

Description: Echo will send the input string to standard output. The output strings are separated by white space characters, and a newline number is added at the end.

Function: Display characters

Syntax: Echo [-nee] [string]

The echo command common options Description:

1,-N: no automatic line wrapping

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2,-e: Usually combined with the escape character "\" to use, so that the escape character (if the following characters appear in the string, it is handled in particular, but not as a general text output)

\a issued a warning sound

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\b Delete the previous character

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\c suppresses the characters following the output and does not wrap automatically

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\e Delete a character after

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\ n Force line break

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\ r The cursor moves to the beginning of a line, but does not wrap, overwriting the character at the beginning of the line

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\ t inserts a horizontal tab

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\v Inserting vertical Tabs

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\ \ insert \ Symbol

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3.-E: Escape character with backslash disabled (default)

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4. Output of variable value, usage: Echo $ variable Name

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5, double quotation marks: Indicates weak references, variables are replaced

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6. Single quotes: denotes strong references, and variables are not replaced

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Second, echo output the content of the specified color

1, usage: Need to combine the-e option and "\033" piece to use

Format: echo–e "\033[foreground color; background color m string \033[0m"

Note: The foreground color and background color position can be interchanged

Foreground color: 30m-37m

Black: echo-e "\033[30m black character \033[0m"

Red: echo-e "\033[31m red word \033[0m"

Green: echo-e "\033[32m green word \033[0m"

Yellow: echo-e "\033[33m yellow word \033[0m"

Blue: echo-e "\033[34m blue word \033[0m"

Purple: Echo-e "\033[35m purple word \033[0m"

Sky blue: Echo-e "\033[36m sky blue Word \033[0m"

White: echo-e "\033[37m white character \033[0m"

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Background color: 40m-47m

Black: Echo-e "\033[40m Black Bottom \033[0m"

Red: echo-e "\033[41m Red Bottom \033[0m"

Green: Echo-e "\033[42m Green Bottom \033[0m"

Yellow: echo-e "\033[43m Yellow Bottom \033[0m"

Blue: echo-e "\033[44m Blue Bottom \033[0m"

Purple: Echo-e "\033[45m Purple Bottom \033[0m"

Sky blue: Echo-e "\033[46m sky blue Bottom \033[0m"

White: echo-e "\033[47m White Bottom \033[0m"

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Example: The output of the yellow-bottom red Word display echo-e "\033[31;43m aaaaaaaaaaaa \033[0m"

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2. Control option Description

\033[0m Close All Properties

\033[1m Setting High brightness

\033[4m Underline

\033[5m Flashing

\033[7M Reverse Display

\033[8m blanking

\033[30m-\33[37m Front View

\033[40m-\33[47m background Color

\033[na the cursor to move n rows

\033[NB cursor down n rows

\033[NC cursor right shifts n rows

\033[nd cursor left n rows

\033[Y;XH Setting the cursor position

\033[2J Clear Screen

\033[k clears the contents from the cursor to the end of the line

\033[s Save Cursor position

\033[u Restore cursor Position

\033[?25l Hide Cursor

\033[?25h Display cursor

Example: the content of the output is required to be underlined and flashing in blue-bottom red characters

Echo-e "\033[31;44;4;5m aaaaaaaaaaaa\033[0m"

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This article is from the "Linux Operational Learning path" blog, please be sure to keep this source http://fengliang.blog.51cto.com/3453935/1829678

Summary of the use of Echo under Linux