中国DOS联盟

Command Prompt
In batch processing

Remembered, thank you

For the `for` command in DOS, there are several common usages:

1. `for %variable in (set) do command ` - Iterates over a set of files or values. For example, `for %i in (*.txt) do type %i` to display the contents of all text files.

2. `for /f %variable in (file-set) do command ` - Reads the contents of a file and performs commands on each line. For example, `for /f "delims=" %i in (test.txt) do echo %i` to echo each line in the test.txt file.

3. `for /l %variable in (start, step, end) do command ` - Performs a loop from the start number to the end number with a specified step. For example, `for /l %i in (1,1,5) do echo %i` to echo numbers 1 to 5.

4. `for /r path] %variable in (file-set) do command ` - Recursively searches for files in a directory tree. For example, `for /r c:\ %i in (*.exe) do echo %i` to echo all executable files in the C drive and its subdirectories.

The format is

for/? %? + method + (range) + action + starting object + %?

Is it like this?

It means what kind of way and within what range to perform an action on an object by taking the desired result as a variable %X, and then display the result?

　　Well, it's roughly like this. As long as you truly understand its principle by yourself. It is still recommended to practice the use of the for statement more. After practicing more, you will naturally have a better understanding of it and be more proficient in using it to solve problems.

Okay, thank you. I'll take a look at the help in cmd.

FOR /F %variable IN (file-set) DO command
FOR /F %variable IN ("string") DO command
FOR /F %variable IN ('command') DO command

file-set refers to specifying a file or files.
"string" refers to specifying a string directly.
'command' refers to executing a command and using its output.

Can "options" load these
eol=c
skip=n
delims=xxx
tokens=x,y,m-n
usebackq

Re: ghtfuo

　　file-set: represents that the object for which for is executed is a file, or multiple files, and supports wildcards "?" and "*" at the same time;

　　"string": indicates that the object for which for is executed is a string, such as the string "www.Cn-Dos.Net";
　　The result of executing for /f "tokens=1,* delims=-" %i in ("www.Cn-Dos.Net") do @echo %i+%j is: "www.Cn+Dos.Net";

　　'command': indicates that the object for which for is executed is the output of a command, such as the command "ipconfig /all";
　　The result of executing for /f "delims=: tokens=1*" %i in ('ipconfig /all^|find /i "ip address"') do @echo %j is your IP address.

　　As for "Options", you are right.

　
　　You need to experience the usage of this command more to truly master it.

Last edited by lxmxn on 2006-10-30 at 06:24 AM ]

The meaning of delims is to split and combine the processing results of each loop in the execution statement into a set. Tokens is to take a character obtained by moving a certain step forward at a time? The meaning of "add^|find /i "" in the parentheses of ('ipconfig /add^|find /i "ip address"') I don't understand.

Last edited by ghtfuo on 2006-10-30 at 06:21 AM ]

hh ntcmds.chm::ntcmds.htm

　　Re: ghtfuo

　　Oh, sorry, I made a mistake. I've corrected it. Here, "add" should be "all". This "/all" is a parameter of the "ipconfig" command. Its function is to display the detailed information of the current TCP/IP configuration of the computer, including IP, MAC, gateway, and host name, etc. This is in contrast to the situation where the "ipconfig" command has no parameters..

　　Here, "('ipconfig /all^|find /i "ip address"')" should be understood in two parts. One is "ipconfig /all", and the other is "find /i "ip address"". The former has been explained above, and the "/i" in the latter is a parameter of the "find" command, which means ignoring case when searching. Let's take an example.
　　For example, there is a file abc.txt with the following content:
--------------------abc.txt---------------------------------------------
www.Cn-DoS.net
www.cn-dos.net
--------------------abc.txt---------------------------------------------
There are only these two lines. Then, executing "find "Cn-DoS" abc.txt" in the command prompt can find the content of the first line. If you use "find "cn-dos" abc.txt", you can find the content of the second line. If you use the "/i" parameter, it means ignoring case when searching. So, if you execute "find /i "cn-Dos" abc.txt", then both lines in abc.txt can be found..

　　Here, "^|" is the pipe symbol, which functions to transfer the result of "ipconfig /all" to the "find /i "ip address"" command. It can also be understood as taking the result of "ipconfig /all" as the object of the "find /i "ip address"" command. And the "^" symbol here is an escape character. The reason for adding this "^" is determined by the characteristics of the for command. When using the pipe symbol "|" inside the parentheses of the for command, a "^" must be added in front as an escape.

　　In addition, it is recommended that you read more of the system's built-in help documents. Or directly view the help with "command /?" in the command line.

hh ntcmds.chm::ntcmds.htm

Last edited by lxmxn on 2006-10-30 at 07:30 AM ]

As soon as you mention it, you'll understand. It's just that this help file can't be found, which is why I'm asking.