As a walking lake for many years old Chinese medicine, today was ordered to solve a case of the front-end page show slow problem. The status of the problem page is as follows:
Apache + PHP
Using the Smarty template to output content
The final output of the page is large, 80k+
Page execution time is above 500ms
Sacrifice a magic weapon xhprof the problem page to do a careful check, found that the page bottleneck is actually a template (compiled) in an ec
Usage: seq [options] ... TailOr: seq [options] ... First Count MantissaOr: seq [options] ... First number increment MantissaTwo ways to cycle from 1 to 100 (bash other shells have not tried)For x in ' seq 1 ';d o echo $x;d oneFor x in {1..100};d o echo $x;d oneEcho-n Non-newline output$echo-N "123" $echo "456" final ou
Linux echo command, linuxecho
This article is reproduced in: http://www.cnblogs.com/ZhangShuo/articles/1829589.html
Linux echo commands are very common in shell programming and are often used to print the variable value in the terminal. Therefore, it is necessary to understand the echo usage.
The echo command is used t
Linux echo commands are very common in shell programming and are often used to print the variable value in the terminal. Therefore, it is necessary to understand the echo usage.
The echo command is used to display a piece of text on the monitor, which generally serves as a prompt.The general format of this command is Echo
To create an empty file:Touch Akeke.log
Use Echo to create a new file and simply edit a file:#echo "I am Wuyike" >wuyike.txtThen use Cat view: #cat wuyike.txt
The difference between > and >>:
> is to empty and add new content, i.e. redirect>> is to append a new content after the file content, that is, append redirect
Append content to a file with Cat: (Pros: Multiple lines of content can be
0.echo Command entry: (Default bash support, CSH not supported)-N does not output line breaks-E Open backslash ESC escape-e Suppress backslash ESC escape (default)Both 1.echo and printf can print output information, except that Echo adds a newline character (\ n) by default;Echo-n "XXXX" can also cancel line break2.
Echo is an internal command of the shell that prints the specified string on the screen. Command format:Echo ArgYou can use echo to achieve more complex output format control.Show escape charactersecho "\" It is a test\ ""The result will be:"It is a test"Double quotes can also be omitted.Show VariablesName= "OK" echo "$name It is a test"The result will be:OK It i
echo Command:Function: Display textSyntax: Echo [-nee][string]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.Double quotes can only recognize variables (weak references), single quotes do not recognize anything (strong references), and inverted s
Linux echo commands are very common in shell programming and are often used to print the variable value in the terminal. Therefore, it is necessary to understand the echo usage.
The echo command is used to display a piece of text on the monitor, which generally serves as a prompt.The general format of this command is Echo
Windows 2000 and XP, by default, turn off the Telnet echo, which is inconvenient to operate, and for the Telnet program to implement local echo, you can do the following:
1. Run a telnet command with no arguments in the command window, perform/help view the subcommand for Telnet
Telnet has the following instructions:
Close closes the current connection
Display operation parameters
Open Connect to a si
In HTML and PHP writing, echo can output multiple strings at the same time, and does not require parentheses.
Print can output only one string at a time, requiring parentheses.
The use of print is similar to the C language, so you will have a special explanation for the% in the output.
ECHO has no return value, and print () has a return value that returns Flase when its execution fails, such as a disconnect
# alias ccc= ' mkdir '
The definition of CCC is an alias for mkdir, and this method defines an alias that is temporarily valid. Failed after restarting the system.Notice the alias, followed by the system commands, the previous custom name does not and the system commands duplicate.
# Unalias CCC cancellation alias
# aliases yyy= "Ls-l"
the difference between single and double quotes and the echo command"A special symbol is a symbol in single quo
Current results: Speaker read local data, Mic recorded real-time data, can be 90% to eliminate the echo, Aecdelay also need to tune, NS and VAD are normally available. First ensure the AEC normal, next speaker real-time network data, from double talk there is a long way, refueling.
Effect Diagram:
Real-time audio echo cancellation Flowchart:
key points of knowledge:
1, the purpose of
Tags: escape character ddd com C language and so on call string Lin pngPrintfHave you ever been in touch with printf? If you learn C language you must be familiar with, if not, do not hurry, I guarantee you will soon!Let's take a look at the case: As you can see, the echo output will wrap the text, but the printf command will not wrap, and you may want to change the line oh, what would you do?? That's it, are you going to feel the trouble??
If you want to use the echo command to display a command, you can use the following syntax: Echo [Message]
Parameter on | offSpecifies whether to allow command echo. To display the current echo settings, you can use echo without parameters.Command.
The following code:
The ECHO command is a sub-command of DOS batch processing commands that everyone is familiar with. However, you may not know all of its functions and usage:
1. As a switch to control whether the batchcompute command displays the command line itself during execution
Format: ECHO [ON | OFF]
To disable the display of the "echo off" command line, add "@" before th
1, what is Laravel EchoEcho is a tool that allows us to easily implement WebSockets in Laravel applications (about websockets working principles and mechanisms to refer to this article: WebSocket combat) while simplifying building complex websockets interactions for more general, Complex part.
Note: Echo is still in the development phase, the tutorial code and the final release version may be in discrepancy, I hope.Echo is made up of two parts: a ser
Script execution1. Give execution permission to run directlychmod 755 hello.sh./hello.sh #需要使用文件的绝对路径或相对路径2. Execute script via bash callEcho Output commandSyntax: Echo [-e] [output CONTENT]-E: Character conversions that support backslash controlEG1: Output Hello world!echo ' Hello world! 'Attention:If you want to output an exclamation point, the output must be enclosed in single quotesEG2: Use the-e parame
Image upload and echo back end chapterLet's look at the effect first.After an image upload and echo, we come to the actual situation of the entire process of uploading, today we will get through the front and back, we come to the real understanding, we upload the file, to what kind of form to the server, is also a picture? Wait, we'll find out.Before we start the actual battle, let's do some preparatory wor
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