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Linux Basic Command-echo

echo commandFunction: Display character (trailing line wrapping function)Syntax: Echo [-nee][string]Description: Echo will send the input string to standard output. The output string is separated by a white space character, and a newline number is added at the end-n is not at the end of the character wrap-E If the following character appears in the string, it is

Linux echo Command Introduction and-N,-e parameter detailed

The echo command is used to print the value of the shell variable in the shell, or to output the specified string directly. The echo command of Linux, which is very commonly used in shell programming, is often used when printing variable value in a terminal, so it is necessary to understand that the function of the echo command is to display a piece of text on th

Tlcl-the world echo from the Shell's eyes

See the world from the shell 's eyesecho- display a line of textWhen you enter a command,bash expands on the characters you enter before executing the command. Path expansionecho *The Shell expands * to the name of the file under the current directory and prints out the name of the file in the current directory .echo d* print out all files starting with D in the current directoryecho *d prints out all files in the current directory ending in D~ Ex

Shell Script Learning 14 Shell echo command

Echo is an internal command of the shell that prints the specified string on the screen. Command format: Echo Arg You can use echo to achieve more complex output format control.Show escape characters echo "\"It is a test\ "" The result will be:"It is a test"Double quotes can also be omit

The difference between Echo and print in PHP _php tips

In general, the dynamic output of HTML content in PHP is done through print and ECHO statements, and in practice, the print and ECHO functions are almost identical. It can be said that there is a place to use, and the other can be used. However, there is also a very important difference: in the Echo function, you can output multiple strings at the same time, wher

Linux Learning notes-how to write content to a file using the echo command

0. PrefaceThis article summarizes how to use the echo command to write content to a file, such as using the ECHO directive to overwrite the contents of a file. Use the echo command to append content to a file. Use the Echo command to append tabs to the file. The basic way for Echo

WEBRTC Echo Cancellation (AEC, AECM) algorithm introduction (RPM)

WEBRTC Echo Cancellation (AEC, AECM) algorithm introduction NBSP;WEBRTC echo Cancellation (AEC, AECM) algorithm mainly includes the following important modules: 1. Echo Delay Estimation 2.NLMS ( Normalized minimum mean square adaptive Algorithm) 3.NLP (nonlinear filtering) 4.CNG (Comfort Noise generation), the general classic AEC algorithm should also include d

The difference between print (), Print_r (), Echo () in PHP _php tips

ECHO is a PHP statement, print and Print_r are functions, statements have no return value, and functions can have return values (even if they are not used) Print () only prints the value of a simple type variable (such as int,string) Print_r () can print out the values of complex type variables (such as arrays, objects) echo outputs one or more strings Print--Output a string Description int print (str

Linux Commands---echo, wall, write, clear, sync, uptime commands

EHCO command: Display a line of text"Feature" will print out the content by default, which is most commonly used in the shell.Syntaxecho option argument"Common options"-E activates escape characters\b: Delete the previous character \c: End with a newline symbol \ n: newline and the cursor moves only the beginning of the line \ r: The cursor moves to the beginning of the line, but does not wrap \ t: Insert tab\\: Insert "\" characterInstancePrint the given string directly [[emailprotected]tmp]#

Linux commands (3) echo

Linux of the Echo Command , in the Shell extremely popular in programming , Print variables under the terminal value is often used. , Echo command in the build Shell play an important role in scripting1. command FormatEcho[options] [String]2. Command functionList all subdirectories and files in the destination directory3. Command Parameters- N do not wrap at the end of the lineThe--HELP displays help

Shell script return, ECHO, printf

Ehco and returnreturn Returned is the status code, function end Return does not return function return value You can return the function return value with echo in front, return the specified function exit status code Echo returns the function return value, the function exit status code is the exit status code of the last command of the functiontest1.sh#!/bin/bashfunctiontest () { echo200 }ret=$ (t

Brief analysis of WEBRTC echo cancellation module

Welcome to Join WEBRTC Learning Group (659922087) to obtain free learning resources, mutual communication and growth. WEBRTC of the Echo Cancellation (AEC, AECM) algorithms mainly include the following important modules: Echo delay estimation, NLMS (normalized minimum mean square adaptive algorithm), NLP (nonlinear filtering), CNG (Comfort noise generation). The General classic AEC algorithm should also inc

Mac compiler installation Nginx and Nginx-echo-module

Objective:I installed nginx-echo-module The original intention is encountered some time ago, although there are configuration location rules, but in the browser access, there is an error, such as mismatch or do not meet the expected situation, want to know if there is actually a match which location rule, But Nginx log can only record the request URL, so, see echo output is very happy, after all, feel retur

Linux View log file Contents command tail, Cat, TAC, head, Echo

!------------------------------------------The echo command in Linux is used to display a section of characters on the standard output, such as:echo "The echo command test!"This will output "the echo command test!." This line of text!echo "The echo command test!" >a.shThis w

Shell Step by Step (4)--cron & Echo

6. Script timed Tasks# Example of job definition:# .------------------------- minute (0 - 59)# | .--------------------- hour (0 - 23)# | | .----------------- day of month (1 - 31)# | | | .------------- month (1 - 12) # | | | | .--------- day of week (0 - 6) # | | | | |# * * * * * user-name command to be executed7. View the UID of the current userroot @kallen :/usr/data/kallendb_backup # ps-ef | grep UID uid pid ppid c stime T

In the shell of Linux, echo changes the output display style

Echo-e "\033[32;49;1m [done] \033[39;49;0m"Output Result:[Done]  The color of the text terminal can be generated by using the ANSI unconventional character sequence. Example:Echo-e "\033[44;37;5m ME \033[0m COOL"The above command sets the background to blue, foreground white, blinking cursor, output character "ME", then reset screen to default settings, output character "COOL". "E" is an optional option for the command

WEBRTC echo Cancellation (1)

There are two types of echoes in voice calls:1. Circuit echo (already resolved)2. Acoustic echoTwo echo cancellation modules are designed in the WEBRTC source code:1.AEC (Acoustic Echo canceller): PC side2.AECM (Acoustic Echo Canceller mobile): MobileAECM:Causes of acoustic Echo:The voice of the proximal speaker is pic

echo, print, printf and sprintf distinguish _php tips

-Echo is a command and cannot return a value. Echo can be followed by many parameters, separated by semicolons, such as: echo $myvar 1; Echo 1,2, $myvar, "bold"; -Print is a function that can return a value and can have only one argument. -printf function, format the text after the output, such as: $name = "H

The usage of ECHO in Linux __linux

The echo command of Linux, which is very commonly used in shell programming, is often used when printing variable value under a terminal, so it is necessary to understand the use of the following Echo The function of the echo command is to display a piece of text on the monitor, which generally acts as a hint.The general format for this command is:

Let the echo output in the shell script color

Http://www.linuxidc.com/Linux/2014-12/110463.htm#!/bin/bash#定义颜色的变量Red_color= ' \e[1;31m ' #红Green_color= ' \e[1;32m ' #绿Yelow_color= ' \e[1;33m ' #黄Blue_color= ' \e[1;34m ' #蓝pink= ' \e[1;35m ' #粉红res= ' \e[0m '#需要使用echo-EEcho-e "${red_color}======red Color======${res}"Echo-e "${yelow_color}======yelow Color======${res}"Echo-e "${blue_color}======green Color====

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