Introduction to common batch internal commands

Echo " Welcome to the very bat! " Pause

Simpleexample

Save the above code in bat or CMD format, and double-click to run will display the following two lingo on the screen:

Welcome to the very bat!
Please press any key to continue ...

Common commands:

1	REM and::	REM is a comment command, after which the contents of the command are not executed, but can be echoed. :: Can also act as an annotation, but there are 2 points: ① any word that begins with: lines is treated as a label in the batch, ignoring all subsequent contents. Valid designator:: followed by a string preceded by an alphanumeric, the Goto statement can be identified. Invalid Label:: followed by a non-alphanumeric special symbol, goto unrecognized label, can play the role of annotation, so:: is often used as an annotation symbol, in fact: + can also play an annotated role. Unlike REM, ②: The post-character lines is not echoed at execution time, regardless of whether you open the command-line echo state with Echo on, because The command interpreter does not consider him to be a valid command line; In addition, REM can be used for Config.sys files. In-line comment:% Note content% (infrequently used, caution)
2	ECHO and @	The @ character is closed before the command is echoed, regardless of whether Echo is turned on. The function of the echo command: ① turn on/off echo function Format:echo [{On|off}] If you want to turn off the display of the ECHO off command line itself, you need to precede the command line with "@". ② Display the current echo settings status Format:Echo ③ OUTPUT hint Information Format:ECHO Information Content ④ Close the DOS command prompt Type in the DOS prompt stateECHO OFF, you can turn off the display of the DOS prompt so that the screen leaves only the cursor until you type ECHO on, the prompt will not appear again. ⑤ outputs a blank line, which is equivalent to entering a carriage return Format:ECHO.(. You can't have spaces in the middle of the echo, otherwise.) will be treated as a message output. Another. Available,:; "/[\]+, etc. any symbol substitution) Command echo. The output of the return, the DOS pipeline steering can be used as input to other commands, such as echo.| Time is equivalent to giving a carriage return after the time command executes. Therefore, the system will automatically return to the DOS prompt after the current time is displayed. ⑥ reply to a question in the command Format:ECHO Reply | command file name It can be used to simplify the operation of some commands that require man-machine dialogue (e.g. Chkdsk/f;format Drive:;del * *), It is the input to the man-machine Dialogue command by a DOS pipeline command to output the echo command in the preset reply. The following example is equivalent to entering a "Y" carriage return when a conversation occurs in a invoked command: C:>echo y| chkdsk/f C:>echo y| DEL A:*. * ⑦ Create new File/Add File contents Format:echo File contents > FileName echo File contents >> file name C:>echo @ECHO off>autoexec. BAT to create an automatic batch file C:>echo c:\cpav\bootsafe>>autoexec. BAT appends content to an automatic batch file C:>type AUTOEXEC. BAT displays the automatic batch file ⑧ Print content/print control code to printer Format:ECHO Printer control code >PRN 　　 ECHO Print Content >prn The following example is a print control code that is entered into the M-1724 printer. <Alt> 156 is to hold down the ALT key on the keypad, type 156, and so on: C:>echo +156+42+116>prn (Input underline command fs*t) C:>echo [Email protected]>prn (Input initialization command [email protected]) C:&GT;ECHO.&GT;PRN (line wrapping) ⑨ the horn.ECHO ^g "^g" is a ctrl+g or alt+007 input in a DOS window, and multiple ^g can produce multiple beeps. The way to use it is to directly Called in a batch file or made into a batch file.
3	PAUSE	Stops the execution of the system command and displays the following content. Example:PAUSE Run Display: Please press any key to continue ... To display additional prompts, you can use: Echo Other Tips & Pause > nul
4	ERRORLEVEL	Program return code Echo%errorlevel% Each command runs the end, can use this command to view the return code, to determine whether the command was executed successfully, the default is 0, General Command execution error will be set ERRORLEVEL to 1
5	TITLE	Set the title of the cmd window title new Headline #可以看到cmd窗口的标题栏变了
6	color	Sets the default console foreground and background color.
7	Mode	Configure the system device. Serial port: MODE comm[:] [baud=b] [parity=p] [Data=d] [stop=s] [To=on|off] [Xon=on|off] [Odsr=on|off] [Octs=on|off] [DTR=ON|OFF|HS] [RTS=ON|OFF|HS|TG] [Idsr=on|off] Device status: MODE [device] [/status] Print redirection: MODE lptn[:]=comm[:] Selected code page: MODE con[:] CP select=yyy code page Status: MODE con[:] CP [/status] Display mode: Mode con[:] [cols=c] [lines=n] Keystroke rate: MODE con[:] [rate=r Delay=d] Cases: Mode con cols=113 lines=15 & Color 9f This command sets the DOS window size: 15 rows, 113 columns
8	GOTO and:
9	FIND
10	START
11	Assoc and Ftype
12	Pushd and POPD
13	Pager
14	Shift
15	IF
16	setlocal and variable delay
17	ATTRIB Display or change file properties

Introduction to common batch internal commands