中国DOS联盟

How to extract a column of characters from each line in the file and perform the following algorithm. (Sum of lines of function shu down time) minus (Sum of lines of boot star time) such as 54883 + 54891 + 55849 - 54877 - 54887 - 55843 =?

for /f "delims=! tokens=2" %%i in (1.txt) do(??????????)
The following is file.1.txt!
boot star time 2006-06-06 星期二 15:14:37.57 record! 54877
shut down time 2006-06-06 星期二 15:14:43.27 record! 54883
boot star time 2006-06-06 星期二 15:14:47.66 record! 54887
shut down time 2006-06-06 星期二 15:14:51.36 record! 54891
boot star time 2006-06-06 星期二 15:30:43.18 record! 55843
shut down time 2006-06-06 星期二 15:30:49.99 record! 55849

@echo off
set n=0
set sum=0
for /f "delims=! tokens=2" %%i in (1.txt)  do (
call :s %%i
)
echo %sum%
goto :EOF

:s
set /A n+=1
if "%n%"=="1" (set /A sum-=%1)else set /A sum+=%1 & set n=0
goto :EOF

boot star time is a single line
shut down time is a double line
Then the following code can achieve the requirements of the landlord.

@echo off
set n=0
set sum=0
for /f "delims=! tokens=2" %%i in (1.txt)  do (
call :s %%i
)
echo %sum%
goto :EOF

:s
set /A n+=1
if "%n%"=="1" (set /A sum-=%1)else set /A sum+=%1 & set n=0
goto :EOF

Last edited by doscc on 2006-6-7 at 12:15 ]

Thanks!
Learned another thing again.!
GOTO:EOF is to return to which FOR statement, right.!
%1 is to inherit the %i of the FOR statement, right!.

If I want to implement the nesting of two for statements, to achieve, for example, for /f "delims=! tokens=2" %%i in (1.txt) do(......)
Define these variables to set1~set6 respectively. For example (set1=54877 ,set2=54883
set3=54887......)

I want to see how the variables of the two for statements are passed.!
Thanks

It should be able to be more concise. The following code:
@echo off&setlocal enabledelayedexpansion
set /a l=0
for /f "tokens=2 delims=!" %%i in (1.txt) do (
set /a l=%%i+!l!
)
echo %l%

re : bagpipe
set /a l=%%i+!l! is to accumulate six numbers. This does not match my proposal.

@echo off&setlocal enabledelayedexpansion
set /a l=0
for /f "tokens=2 delims=!" %%i in (1.txt) do (
set /a n+=1
if !n!==1 (
set /a l=!l!-%%i
) else (
set /a l=!l!+%%i&set n=0
)
)
echo %l%
Weeping and leaving.........

@echo off & setlocal EnableDelayedExpansion
for /f "tokens=8" %%i in (1.txt) do (
    set /a c+=1
    set set!c!=%%i
)
set set

Re: piziliu2004 (Floor 3):

Actually, your proposition doesn't need and is difficult to implement with nested loops, and the variable transfer between loops is not very complicated. Basically, it can be said that in the inner loop, you can directly use the variables of the outer loop, as long as it is not overwritten by the variables of the inner loop, which depends on the naming of the variables. For example:

for /l %%i in (1,1,5) do for %%j in (a,b,c,d) do echo.Counter:%%i%%j

As for what you mentioned about getting the file content line by line into environment variables, it doesn't seem to make much sense, because usually we all get a line of content and then immediately perform various processing and output it. But still, sample code is given for reference.

@echo off & setlocal EnableDelayedExpansion
for /f "tokens=8" %%i in (1.txt) do (
    set /a c+=1
    set set!c!=%%i
)
set set

Thanks willsort
Moderator.
Little brother wants to ask a few questions
1:.set set is to display all current set variables? Why does my rem "set set" fail to set variables?

2: Also, why does inserting "echo %set!c!%" after set set!c!=%%i display a failure?

1: set set will display the value of %set%!
2: After set set!c!=%%i, there cannot be other commands, otherwise all will become variables!

Still a bit confused.
1: "set set" will display the value of %set%! Then why does just displaying %set% make the entire batch script unable to achieve the function of setting variables when using "set set"?
2: After "set set!c!=%%i", there cannot be other commands, otherwise they will all become variables! Why is that? Is it because of!c!?
3: By the way, why can't!c! be replaced with %c%?

There is no SET SET, it's just that the values of set1, set2, etc. are not displayed!

re:qwe1234567
Moderator, thank you! I misunderstood.
This is how I judged. rem set set--> After the batch processing is executed and returns to the command line, ,--> I execute "set" but can't see the set1~setn variables.
After verification, it turns out that if I don't remove set set. I execute set and I still can't see the set1~setn variables.

1: Why can't I see the set1~n variables I set. Is it because of the batch processing setlocal EnableDelayedExpansion?

2: If I want the batch processing to end and then execute set under the dos command and still see the variables I set, how to achieve it?

@echo off & setlocal EnableDelayedExpansion
if exist _setvar.bat del _setvar.bat
for /f "tokens=8" %%i in (1.txt) do (
    set /a c+=1
    echo set set!c!=%%i>>_setvar.bat
)
endlocal & if exist _setvar.bat (call _setvar.bat & del _setvar.bat)
set set

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Re piziliu2004:

!c! is the usage of variable delayed expansion. There have been multiple explanations in this forum. It is recommended that you search first. In addition, you can refer to the command line help information of cmd /?.

The failure of set1~n is indeed due to setlocal. For specific details, please refer to setlocal /? and the relevant information in Windows Help and Support Center.

Usually, we don't need to keep the variable modifications in the batch file after the batch file ends, especially in the case of multiple variables. If you have such a need, it means that there is a certain defect in the program structure design. Of course, it is possible to keep variable modifications outside the batch file. The simplest way is not to use the setlocal command. If you must use it, such as using it to enable the variable delayed expansion feature, you need to use another trick.

I rarely use this trick. It is only used when it is difficult to avoid using setlocal and variables must be saved for external program reference. The method is to use the rarely used endlocal command. For example, if you want to keep the modification of variable envar before the program ends, you can insert the following statement at the end of the program.
endlocal & set envar=%envar%

For the code on floor 8, it is relatively more complicated because multiple variables with dynamic names need to be retained. The following code can be used.

@echo off & setlocal EnableDelayedExpansion
if exist _setvar.bat del _setvar.bat
for /f "tokens=8" %%i in (1.txt) do (
    set /a c+=1
    echo set set!c!=%%i>>_setvar.bat
)
endlocal & if exist _setvar.bat (call _setvar.bat & del _setvar.bat)
set set

Last edited by willsort on 2006-6-8 at 20:44 ]