windows - Split a text file if two consecutive lines almost identical -


i need split text file (using .bat command) based on content of string of previous line (from position 2 13) , content of string of current line (from position 2 13)...

i explain:

my file looks that:

ia1234567890a         xx33              aze bla1                  xx34              des bla2                  xx34              des bla3                  xx34              des fa1234567890a         xx35              aze ia1234567890a         xx36              aze bla4                  xx34              des bla5                  xx34              des bla6                  xx34              des fa1234567890a         xx37              aze ib0987654321a         xx38              aze bla7                  xx34              des bla8                  xx34              des bla9                  xx34              des fb0987654321a         xx39              aze

i want split file when first 12 characters of 1 line starting "i" (without taking account "i") different first 12 characters of previous line (which starting "f" except first line, comparison should not take account "f").

so not split file between these 2 lines:

fa1234567890a         xx35              aze ia1234567890a         xx36              aze

but split file between these 2 lines:

fa1234567890a         xx37              aze ib0987654321a         xx38              aze

i know how split file using delimiter, totally lost comparison thing...

i appreciate if 1 of me of tricky case...

thanks!

if input file large, method should run faster because not check all lines. correctly process lines special batch characters.

@echo off setlocal enabledelayedexpansion  rem read first line, , create dummy previous "endline" same name set /p "endname=" < test.txt set "endname=f%endname:~1%" set startline=1 set "startname="  rem redirect input file code block, in order read < test.txt (     rem locate lines start "i" or "f"    /f "tokens=1,2 delims=: " %%a in ('findstr /n /b "i f" test.txt') (       if not defined startname (          set "startname=%%b"          if "!startname:~1,12!" neq "!endname:~1,12!" (             rem new section starts: copy own file             set /a lines=endline-startline+1             (for /l %%i in (1,1,!lines!) (                set /p "line="                echo !line!             )) > "part !endname:~1,12!.txt"             set "endname=f%startname:~1%"             set "startline=%%a"          )       ) else (          set "endline=%%a"          set "endname=%%b"          set "startname="       )    )     rem copy last section own file    findstr "^" > "part !endname:~1,12!.txt" )

output:

c:\> type part*.txt  part a1234567890a.txt   ia1234567890a         xx33              aze bla1                  xx34              des bla2                  xx34              des bla3                  xx34              des fa1234567890a         xx35              aze ia1234567890a         xx36              aze bla4                  xx34              des bla5                  xx34              des bla6                  xx34              des fa1234567890a         xx37              aze  part b0987654321a.txt   ib0987654321a         xx38              aze bla7                  xx34              des bla8                  xx34              des bla9                  xx34              des fb0987654321a         xx39              aze

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