English original meaning: EchoProtocol Chinese interpretation: response protocol annotations, mainly used for debugging and testing. It can be based on the TCP protocol, the server detects the presence or absence of a message on TCP port 7. If the UDP protocol is used, the basic process is the same as TCP, and the detected port is also 7. The route is also the most commonly used data packet in the network. You can know the path of the current connection node by sending the echo packet, and the path length can be obtained by the round trip time.
Function description: Display text.
Syntax: echo[-ne][string] or echo[--help][--version]
Additional note: 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.
parameter:
-n don't wrap at the end
-e If the following characters appear in the string, they are treated specially, instead of treating it as normal
Text output:
\a issued a warning sound;
\b delete the previous character;
\c Finally does not add a newline symbol;
\f Wraps but the cursor is still in its original position;
Wrap and move the cursor to the beginning of the line;
The cursor moves to the beginning of the line, but does not wrap;
Insert tab;
\v is the same as \f;
\\ insert\character;
Nn insert the ASCII characters represented by nnn (octal);
–help shows help
–version displays version information
ECHO command in DOS batch command
The ECHO command is a subcommand of the DOS batch command:
1. Whether to display the command line's own switch when controlling the batch command during execution
Format: ECHO[ON|OFF]
2. Display current ECHO settings status
Format: ECHO
3. Output prompt message
Format: ECHO Information Content
4. Close the DOS command prompt
Type ECHOOFF at the DOS prompt to turn off the display at the DOS prompt so that the screen only leaves the cursor until you type ECHOON and the prompt reappears.
5. Output blank line, which is equivalent to input a carriage return
Format: ECHO.
It is worth noting that the "." in the command line must be followed by no spaces in the middle of ECHO, otherwise "." will be output as a prompt to the screen. In addition, "." can be replaced with any symbol such as :"/[\]+.
In the example below ECHO. The output carriage return, which is turned via the DOS pipe as the input of the TIME command, is equivalent to giving a carriage return after the TIME command is executed. Therefore, the system will automatically return to the DOS prompt after the current time is displayed: C:>ECHO.|TIME
Another application example of the ECHO command output blank line is: ECHO. Add to the automatic batch file so that the prompt screen that was originally displayed at the bottom of the screen appears at the top of the screen.
6. Reply to the question in the order
Format: ECHO Reply | Command File Name
The above format can be used to simplify the operation of some commands that require human-machine dialogue (such as: CHKDSK/F; FORMATDrive:; del*.*). It uses the DOS pipe command to output the preset response of the ECHO command as a human-machine dialogue. The input of the command. The following example is equivalent to entering a "Y" carriage return when the invoked command has a human-machine dialog: C:>ECHOY|CHKDSK/F
C:>ECHOY|DELA:*.*
7. Create new files or add file content
Format: ECHO file content > file name
ECHO file content>>file name
For example: C:>ECHO@ECHOOFF>AUTOEXEC.BAT to create an automatic batch file
C:>ECHOC:\CPAV\BOOTSAFE>>AUTOEXEC.BAT Appends content to the automatic batch file
C: TYPEAUTOEXEC.BAT displays the automatic batch file
@ECHOOFF
C:\CPAV\BOOTSAFE
8. Output print content or print control code to the printer
Format: ECHO Printer Control Code > PRN
ECHO Print Content>PRN
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