China DOS Union

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 [command-parameters]` - 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 ["options"] %variable in (file-set) do command [command-parameters]` - 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 [command-parameters]` - 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 [[drive:]path] %variable in (file-set) do command [command-parameters]` - 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?

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

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

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 ]

　　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.