中国DOS联盟

------- 1.txt ------
154154 123 2006-9-19
4564567 321 2006-9-30
123 54 2006-10-20


for /f %%i in ('date/t') do set adate=%%i
for /f "tokens=1,2,3" %%i in (1.txt) do if %%k == %adate% echo %%i %%j 1 >>ok.txt

Last edited by HAT on 2008-10-15 at 23:48 ]

First, let's see what your %date/t% is?

>>ok.txt echo %%i %%j 1

1>>ok.txt will write standard output to ok.txt. Anyway, there cannot be a number before > or >>

Originally posted by he200377 at 2006-9-21 05:09:
First, take a look at what your %date/t% is?

Set the current date to a variable, such as adate=2006-09-20

Originally posted by electronixtar at 2006-9-21 08:11:
>>ok.txt echo %%i %%j 1

Writing standard output to ok.txt with 1. Anyway, there can't be a number before > or >>

It still doesn't work after removing 1

Modify the code according to the content of the original poster's 1.txt as follows:

@echo off
setlocal enabledelayedexpansion
for /f "tokens=1-3 delims=- " %%i in ('date/t') do (
set age=%%i
set /a month=1%%j-100
set /a daily=1%%k-100
for /f "tokens=1,2,3" %%a in (1.txt) do (
if /i "%%c"=="!age!-!month!-!daily!" (
echo %%a %%b 1 >>ok.txt
)
)
)

The problem lies in the format, resulting in the if statement judgment being incorrect and unable to perform the redirection.

The format of %date% is 2006-09-19, not 2006-9-19 in 1.txt. So, in your code, the if statement will never hold true in any case.

Also, the format of echo %%i %%j 1 >>ok.txt is incorrect. The final 1 is regarded as a handle value by CMD, which will result in no content being input into ok.txt. What electronixtar said in "Post #3" that "there cannot be a number before >>" is not precise enough. The accurate statement is: If the last column of the echo is any number from 0 to 9, no content will be written into ok.txt.

True expert, problem solved

In addition, the format of echo %%i %%j 1 >>ok.txt is incorrect...
It seems that there is no such error as Brother Feiyang said. If 0-9 are single, they will be regarded as handles, but there are several values before this redirection, so the situation you mentioned will not occur!

The error I'm talking about isn't that it goes wrong when executed, but that the content written into ok.txt isn't the complete content you want. For example, you can run the statement echo 123 1>ok.txt and try it. In ok.txt, it's not the 123 1 you want, but just 123, missing the last column of the number 1.

Try adding a space after 1 more times can solve it

Hehe~ Brother namejm is right.

The problem of unable to redirect is solved by adding a space after the楼主...

　　1、(echo 内容)>test.txt

　　2、>test.txt echo 内容

If the requirements are not too strict, you can add a space after the number in the last column to avoid CMD recognition problems. However, if the requirements are very strict, such as requiring that the numbers 0-9 in the last column be written into the text without a space after them, some processing should be done on the echo statement, and any of the following forms should be used:

　　1、(echo content)>test.txt

　　2、>test.txt echo content

In addition, you can also use the format echo ^content>test.txt, but this form has great limitations, that is, the escape character ^ can only be added in front of a single 0-9 in the last column. If it is the writing of echo ^123 1>test.txt, it is still not working. It should be written as echo 123 ^1>test.txt.

Yes, when this situation occurs, try to use character escaping...

Can be escaped with "" - seen on ntcmds.chm