Extract the content of a specified line and ignore everything else - China DOS Union Forum

Hehe, I searched hard all afternoon and still couldn't find a suitable one, so I hope everyone can help me.

lmod seems like it can.

Hehe, I don't really want to rely on other software to do it.
I just want to use batch files~~ Hehe

Look through it carefully; this was posted before.
Method 1:


for /f "skip=3 delims=" %i in (a.txt) do echo %i

This can display the content starting from the fourth line. If you only want to display the fourth line, you can append &call or &exit at the end.
Method 2:


for /f "delims=: tokens=1,2" %i in ('findstr /n . a.txt') do if "%i"="4" set %i=%j
echo The content of the fourth line is:%4%

Analyze the specific situation specifically.

Thanks for your answer.
Hehe, I already looked through all those, and I also wrote one myself.
It's just that the efficiency isn't very high (that's how it feels to me),
because every file that needs to be analyzed is over 50MB, and I want to be lazy too~~
What I'm thinking is whether it can directly read the second line to save time.

Suddenly I got a new idea. After reading your reply, I was thinking: we use for to search for a certain string, and for needs to traverse, but my string only needs to be found once and that's OK. Can some other command be used, or can it exit the for statement after finding it? My thoughts are a bit messy for now~~~ Please advise.

[ Last edited by kcdsw on 2006-4-25 at 22:33 ]

Read findstr /? a few more times; I hope you can figure out the method yourself.
The reason I gave the first plan is exactly because the first one can skip the first three lines and then end. Just looking at other people's stuff won't improve you much, so think more yourself.
Both methods can improve efficiency with only slight modifications.
Oh right, pay attention to the {"regular expressions" section} + {the "/n" parameter section} in findstr. If you understand these two parts, you can easily hit whatever target you point at.

Dos doesn't support for /f, does it?

I got confused.


@echo off
echo Test environment CMD@WinXP sp2, if you use it on other systems please test first!
echo String searching is needed during execution, please do not modify the related files
echo.
echo Running... please wait patiently

echo ----------------------------Execution info----------------------------
For /f %%a in ('dir /b *.ps') do call :name "%%a"
echo ----------------------------------------------------------------
echo Execution complete, press any key to exit
pause >nul
exit 

:name 
set name=%~n1
if not == goto :eof 
for /f "tokens=2 delims=. " %%i in ('findstr pdn.pdf$ %name%.ps') do set file=%%i.xml
set xmlpath="%appdata%\NewspaperDirect\PressReader\queue\%file%"
for /F "tokens=*" %%c in ('type %xmlpath% ^|find "<title>"') do set paper="%%c"
set paper=%paper:~8,-9%
set paper=%paper:&#x20;= %
set name=%paper% %name:~0,4%-%name:~4,2%-%name:~6,2%
rename %1 "%name%.ps" &&echo %~n1.ps renamed to %name%.ps
goto :eof

ok, going to sleep~~ thank you~~

[ Last edited by kcdsw on 2006-4-26 at 14:02 ]

I'll change the rest tomorrow. The second time it has to query inside the xml, but since the file is small, it doesn't feel like it affects the speed.

At first I used type redirection and used find to search.
Later, when testing findstr, I discovered its pattern and the speed improved greatly. It can finish in 1 second; before that it had to be measured in minutes.
Alright, work will be a lot easier from now on.

[ Last edited by kcdsw on 2006-4-26 at 00:14 ]

If you're after efficiency, you can try ｓｅｄ

sed -n "2{p;q}" file.txt

It can display the second line of the file.
ｓｅｄ download:http://www.student.northpark.edu/pemente/sed/gsed407x.zip

Found a bug

Correction


@echo off
echo Test environment CMD@WinXP sp2, if you use it on other systems please test first!
echo String searching is needed during execution, please do not modify the related files
echo.
echo Running... please wait patiently

echo ----------------------------Execution info----------------------------
For /f %%a in ('dir /b 20*.ps') do call :name "%%a"
echo ----------------------------------------------------------------
echo Execution complete, press any key to exit
pause >nul
exit 

:name 
set name=%~n1
if not == goto :eof 
for /f "tokens=2 delims=. " %%i in ('findstr pdn.pdf$ %name%.ps') do set file=%%i.xml
set xmlpath="%appdata%\NewspaperDirect\PressReader\queue\%file%"
for /F "tokens=*" %%c in ('type %xmlpath% ^|find "<title>"') do set paper="%%c"
set paper=%paper:&#x20;= %
set paper=%paper:~8,-9%
set name=%paper% %name:~0,4%-%name:~4,2%-%name:~6,2%
rename %1 "%name%.ps" &&echo %~n1.ps renamed to %name%.ps
goto :eof

The idea is to use the $ in findstr to delimit the line that needs to be searched at the end.
Because the characters I need only appear on the second line, the efficiency is still acceptable.
But when using the same command to search in an xml file, it went wrong.
In the end I still used type redirection. Fortunately the xml files are not over 20kb, so that's how it is.

I made some simple optimizations to the program. Let's leave it like this for now. Thanks to Wunaihe in the previous post and the brothers above him too~~

[ Last edited by kcdsw on 2006-4-26 at 15:46 ]

Floor1　kcdsw	Posted 2006-04-25 19:37
中级用户　Posts 179　Credits 404
Hehe, I searched hard all afternoon and still couldn't find a suitable one, so I hope everyone can help me.

Floor2　zhangxue	Posted 2006-04-25 19:53
初级用户　Posts 82　Credits 183
lmod seems like it can.

Floor3　kcdsw	Posted 2006-04-25 20:51
中级用户　Posts 179　Credits 404
Hehe, I don't really want to rely on other software to do it. I just want to use batch files~~ Hehe

Floor4　3742668	Posted 2006-04-25 21:04
荣誉版主　Posts 718　Credits 2,013
Look through it carefully; this was posted before. Method 1: for /f "skip=3 delims=" %i in (a.txt) do echo %i This can display the content starting from the fourth line. If you only want to display the fourth line, you can append &call or &exit at the end. Method 2: for /f "delims=: tokens=1,2" %i in ('findstr /n . a.txt') do if "%i"="4" set %i=%j echo The content of the fourth line is:%4% Analyze the specific situation specifically.

Floor5　kcdsw	Posted 2006-04-25 22:28
中级用户　Posts 179　Credits 404
Thanks for your answer. Hehe, I already looked through all those, and I also wrote one myself. It's just that the efficiency isn't very high (that's how it feels to me), because every file that needs to be analyzed is over 50MB, and I want to be lazy too~~ What I'm thinking is whether it can directly read the second line to save time. Suddenly I got a new idea. After reading your reply, I was thinking: we use for to search for a certain string, and for needs to traverse, but my string only needs to be found once and that's OK. Can some other command be used, or can it exit the for statement after finding it? My thoughts are a bit messy for now~~~ Please advise. [ Last edited by kcdsw on 2006-4-25 at 22:33 ]

Floor6　3742668	Posted 2006-04-25 22:42
荣誉版主　Posts 718　Credits 2,013
Read findstr /? a few more times; I hope you can figure out the method yourself. The reason I gave the first plan is exactly because the first one can skip the first three lines and then end. Just looking at other people's stuff won't improve you much, so think more yourself. Both methods can improve efficiency with only slight modifications. Oh right, pay attention to the {"regular expressions" section} + {the "/n" parameter section} in findstr. If you understand these two parts, you can easily hit whatever target you point at.

Floor7　zhangxue	Posted 2006-04-25 22:48
初级用户　Posts 82　Credits 183
Dos doesn't support for /f, does it?

Floor8　kcdsw	Posted 2006-04-25 22:48
中级用户　Posts 179　Credits 404
I got confused. @echo off echo Test environment CMD@WinXP sp2, if you use it on other systems please test first! echo String searching is needed during execution, please do not modify the related files echo. echo Running... please wait patiently echo ----------------------------Execution info---------------------------- For /f %%a in ('dir /b .ps') do call :name "%%a" echo ---------------------------------------------------------------- echo Execution complete, press any key to exit pause >nul exit :name set name=%~n1 if not == goto :eof for /f "tokens=2 delims=. " %%i in ('findstr pdn.pdf$ %name%.ps') do set file=%%i.xml set xmlpath="%appdata%\NewspaperDirect\PressReader\queue\%file%" for /F "tokens=" %%c in ('type %xmlpath% ^\|find "<title>"') do set paper="%%c" set paper=%paper:~8,-9% set paper=%paper: = % set name=%paper% %name:~0,4%-%name:~4,2%-%name:~6,2% rename %1 "%name%.ps" &&echo %~n1.ps renamed to %name%.ps goto :eof ok, going to sleep~~ thank you~~ [ Last edited by kcdsw on 2006-4-26 at 14:02 ]

Floor9　kcdsw	Posted 2006-04-26 00:12
中级用户　Posts 179　Credits 404
I'll change the rest tomorrow. The second time it has to query inside the xml, but since the file is small, it doesn't feel like it affects the speed. At first I used type redirection and used find to search. Later, when testing findstr, I discovered its pattern and the speed improved greatly. It can finish in 1 second; before that it had to be measured in minutes. Alright, work will be a lot easier from now on. [ Last edited by kcdsw on 2006-4-26 at 00:14 ] Attachments 新建 BMP 图像 (2).JPG (91.51 KiB)

Floor10　无奈何	Posted 2006-04-26 00:16
荣誉版主　Posts 356　Credits 1,338
If you're after efficiency, you can try ｓｅｄ sed -n "2{p;q}" file.txt It can display the second line of the file. ｓｅｄ download:http://www.student.northpark.edu/pemente/sed/gsed407x.zip

Floor11　kcdsw	Posted 2006-04-26 15:41
中级用户　Posts 179　Credits 404
Found a bug Correction @echo off echo Test environment CMD@WinXP sp2, if you use it on other systems please test first! echo String searching is needed during execution, please do not modify the related files echo. echo Running... please wait patiently echo ----------------------------Execution info---------------------------- For /f %%a in ('dir /b 20.ps') do call :name "%%a" echo ---------------------------------------------------------------- echo Execution complete, press any key to exit pause >nul exit :name set name=%~n1 if not == goto :eof for /f "tokens=2 delims=. " %%i in ('findstr pdn.pdf$ %name%.ps') do set file=%%i.xml set xmlpath="%appdata%\NewspaperDirect\PressReader\queue\%file%" for /F "tokens=" %%c in ('type %xmlpath% ^\|find "<title>"') do set paper="%%c" set paper=%paper: = % set paper=%paper:~8,-9% set name=%paper% %name:~0,4%-%name:~4,2%-%name:~6,2% rename %1 "%name%.ps" &&echo %~n1.ps renamed to %name%.ps goto :eof The idea is to use the $ in findstr to delimit the line that needs to be searched at the end. Because the characters I need only appear on the second line, the efficiency is still acceptable. But when using the same command to search in an xml file, it went wrong. In the end I still used type redirection. Fortunately the xml files are not over 20kb, so that's how it is. I made some simple optimizations to the program. Let's leave it like this for now. Thanks to Wunaihe in the previous post and the brothers above him too~~ [ Last edited by kcdsw on 2006-4-26 at 15:46 ]