Shulou(Shulou.com)06/01 Report--

Echo command

Function: display characters

Syntax: echo [- neE] [string]

Description: echo sends the input string to standard output. The output strings are separated by blank characters, followed by a line break

Number

Several output modes:

Double quotation mark output:

Single quotation mark output is a silly symbol, which is the original string output.

Reverse single quotation mark command reference

One command calls the execution result of the second command, using ``or $()

Echo "$VAR_NAME": variables are replaced, double quotes are weakly referenced

Echo'$VAR_NAME': variables will not be replaced, strongly referenced

$echo-e "Enter the file name:\ c"

Echo needs to use the-e parameter to print escape characters.

Echo command options:

-n is not in the last automatic line wrapping of the character

-e if the following characters appear in the string, they will be specially treated instead of being output as normal text:

\ a sound of warning

\ b Backspace key

\ c finally, no newline symbol is added.

\ 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

\ insert\ character

\ 0nnn inserts ASCII characters represented by nnn (octal)

Echo-e "\ 033 [43 × 31mred color\ 033 [0m"

\ xHH inserts ASCII characters represented by HH (hexadecimal)

Edit the path where the file's color is located

Command line extended, enclosed collection

Command line extension: $() or ``

Print the output of one command to the parameters of another command

$echo "Thissystem'snameis$ (hostname)"

$echo "I am `whoami`"

Parenthesis extension: {}

Print a simplified form of a duplicate string

$echofile {1JI 3JI 5}

$rm-ffile {1JI 3JI 5}

The echo display in the shell script is displayed with color:

The echo display content in the shell script is displayed with color, and the echo display with color. You need to use the parameter-e.

The format is as follows: echo-e "\ 033 [word background color; text color m string\ 033 [0m"

Word color: 30-37

Echo-e "\ 033 [30m black words\ 033 [0m"

Echo-e "\ 033 [31m red word\ 033 [0m"

Echo-e "\ 033 [32m green word\ 033 [0m"

Echo-e "\ 033 [33m × × × words\ 033 [0m"

Echo-e "\ 033 [34m blue word\ 033 [0m"

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

Echo-e "\ 033 [36m Sky Blue character\ 033 [0m"

Echo-e "\ 033 [37m White word\ 033 [0m"

Word background color: 40-47

Echo-e "\ 033 [40 Ten 37m black background white characters\ 033 [0m"

Echo-e "\ 033 [41bot 37m red background white character\ 033 [0m"

Echo-e "\ 033 [42bot 37m White characters on green background\ 033 [0m"

Echo-e "\ 033 [43bot 37m Yellow background White character\ 033 [0m"

Echo-e "\ 033 [44th 37m Blue background White characters\ 033 [0m"

Echo-e "\ 033 [45th 37m purple background white characters\ 033 [0m"

Echo-e "\ 033 [46th 37m Sky Blue background White characters\ 033 [0m"

Echo-e "\ 033 [47umbent 30m black character on white background\ 033 [0m"

Control options description:

\ 33 [0m turn off all properties

\ 33 [1m set high brightness

\ 33 [4m underline

\ 33 [5m flicker

\ 33 [7m reverse display

\ 33 [8m blanking

\ 33 [30m -\ 33 [37m set foreground color

\ 33 [40m -\ 33 [47m set background color

\ 33 [nA cursor up n lines

\ 33 [nB cursor down n lines

\ 33 [move the nC cursor to the right n lines

\ 33 [nD cursor move left n lines

\ 33 [ytrexh sets the cursor position

\ 33 [2J clear screen

\ 33 [K clear the contents from the cursor to the end of the line

\ 33 [s Save cursor location

\ 33 [u restore cursor position

\ 33 [? 25l hide the cursor

\ 33 [? 25h display cursor

Echo check flicker, understroke, color

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Echo-e "[0m\ 033] [0m\ 033 [4m * *] [0m\ n [0m\ n]

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