China DOS Union

Batch processing has many techniques and can accomplish many things that can't be done well in Windows.
@echo off //Cancel the display of command operation on the screen
echo. |date| find "Current" //Only display the date
echo. |time| find "Current" //Only display the time
:: //Equivalent to rem
call //Call another batch file
del %0 //Self - delete
if "%1" == "string" goto //For example, if "%1" == "/p" goto p
if "%1" == "string" command //if "%1" == "/p" dir /w/p c:
if exist file command //Run the command if the file exists
copy /b //Merge files
fdisk /mbr //Uninstall the master boot record. If the master boot record is overwritten by LILO, it can be used to clear it
prompt $p$g //Restore the prompt
echo Free and Open > new DOS.txt //Write Free and Open into new DOS.txt
echo Happy New year >> new DOS.txt //Continue to write Happy New year into new DOS.txt
lh //Load the device into the upper memory. For example, lh smartdrv /x
mode 80 Restore the default display settings
mode mono Activate the monochrome display
mode con:cols=40-80 lines=25-50 //40-80;25-50 are parameters
Keyboard control
mode con:rate=32 delay=1 //Agile
mode con:rate=20 delay=4 //Accurate
mode con:rate=20 delay=2 //Default
Print control
mode com1:9600,8,N,1 //Fast
mode lpt1=com1
mode com1:2400,8,N,1 //Slow
mode lpt1=com1
echo Hello > prn //Test printing
Install CD - ROM
Add in config.sys
devicehigh=boot\CD-ROM.sys /d MSCD001
Add in autoexec.bat
path boot
mscdex /d MSCD001 /m 12
//CD-ROM.sys can be replaced by universal CD - ROM IDE.sys
//Menu display, selection
echo 1.
echo 2.
echo 3.
...
echo 9.
choice /c:123456789 /n Please choose:
if errorlevel 9 goto 9
if errorlevel 8 goto 8
if errorlevel 7 goto 7
if errorlevel 6 goto 6
if errorlevel 5 goto 5
if errorlevel 4 goto 4
if errorlevel 3 goto 3
if errorlevel 2 goto 2
if errotlevel 1 goto 1

A simple example
@echo off
if "%1" == "/all" goto all
If exist c:\1.txt goto 1
echo The file 1.txt is not found
goto end
:1
echo The file 1.txt exists, press any key to read...
pause > nul
type 1.txt | more
goto end
:all
dir /s/w/p 1.txt
:: Display all 1.txt in the sub - directories of the C drive
:end

Not bad~ But I hope to classify them again, because this way is not convenient for searching and learning.
Ask a question: How to use DEL %0?
Correct some improper places above.
FDISK/MBR does not delete the MBR (Master Boot Record), but overwrites the current MBR content with the default master boot record.
copy /b alone cannot achieve merging. /B specifies merging in binary mode, and /A is for ASIIC files.
copy file1 + file2 +... fileN target file
choice, mode, more are all external commands. When compiling BAT, if these commands are used, it is necessary to consider whether the file exists.

Thanks to NRE for pointing out the inappropriate parts. Add "del %0" at the end of the batch file, and it will self-delete after completion. Most of the above commands can be directly inserted and used in the batch file. It's just that only a part of the skills and less commonly used command parameters are listed, and there are many more to be listed after I sort them out. Of course, if anyone has questions in this regard, I will be happy to answer for you.

This is the first time I've seen this usage of DEL. Classic~
I tried it, and %0 stores the file name of the called file, excluding the extension. So you need to add the extension. del %0.bat to achieve automatic deletion. But when doing this, after running, there will be a prompt of BATCH FILE MISSING.

How is the virtual disk created after booting with the built-in startup disk of Win98?

What is the function of DEL %0 self-deletion????

According to your writing, in DOS, do you need to install UCDOS?

Who can teach me under DOS, I only know how to use FDISK CD DIR DEL SCANDISK MD RD and other commands. Is there any other ones for DOS masters??? Please give more more more guidance!

There are still many.
diskcopy
msav
xcopy
smartdrv
help
deltree
format
sys
...

The command DEL %0 is quite problematic because the %0 parameter actually returns the command line used to execute this batch file. For example, when I want to execute the ABC.BAT batch file, I can enter ABC or ABC.BAT on the command line to execute it. In this way, the value of %0 may be completely different, that is, its value may be "ABC" or "ABC.BAT", etc. And if it is the former, DEL %0, that is, DEL ABC, is impossible to delete the ABC.BAT itself.

Then execute two lines:

DEL %0
DEL %0.BAT

Write both, there will always be one that can delete itself normally~:)

C:\TEMP\t 1 2 3>type demo.bat echo. echo %0 echo %~f0 pause del %~f0 C:\TEMP\t 1 2 3> System prompt: C:\TEMP\t 1 2 3>demo.bat C:\TEMP\t 1 2 3>echo. C:\TEMP\t 1 2 3>echo demo.bat demo.bat C:\TEMP\t 1 2 3>echo C:\TEMP\t 1 2 3\demo.bat C:\TEMP\t 1 2 3\demo.bat C:\TEMP\t 1 2 3>pause Press any key to continue . . . C:\TEMP\t 1 2 3>del C:\TEMP\t 1 2 3\demo.bat The system cannot find the file specified. C:\TEMP\t 1 2 3>

Original note: When deleting a directory name with spaces, there were no quotes in the DEL command :）

C:\TEMP\t 1 2 3>type demo.bat del "%~f0"

Execution:
C:\TEMP\t 1 2 3>demo.bat C:\TEMP\t 1 2 3>del "C:\TEMP\t 1 2 3\demo.bat"

It was deleted~ :）

Thanks to electronixtar for the wonderful %~f0 code, I learned a lot more~ :）
Later, the comment for for /? : %~fI - Expand %I to a fully qualified pathname

This %~f0 is really wonderful~ :）

Learning

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