Batch file to output lines after string match, filename - windows

Question

I have a directory of thousands of text files that begin with tape* (they're output files from an old Fortran program) and I need to extract 4 lines from each file as well as the filename that they were extracted from. The 4 lines begin 4 lines down from a predictable string, but we can use "Header" for this example:
tape1:
First line
...
Header
Trash1
Trash2
Trash3
Data1
Data2
Data3
Data4
...
I don't care about anything before or after those 4 data lines, but I also want the filename (i.e. "tape1") output after each Data line, like so:
Data1 tape1
Data2 tape1
Data3 tape1
Data4 tape1
Data5 tape2
Data6 tape2
...
Any thoughts on an easy Windows batch file to do this on all tape* files in a directory?

Answer 1

#echo off
setlocal EnableDelayedExpansion
for /F "tokens=1,2 delims=:" %%a in ('findstr /N "Header" tape*') do (
(for /L %%i in (-2,1,%%b) do set /P "="
for /L %%i in (1,1,4) do set /P "line=" & echo !line! %%a
) < "%%a"
)

Answer 2

#echo off
cls
rem get a list of file names sorted alphabetically by name
dir /b tape* /ON>.\Files.txt
rem delete any existing output from any previous run
if exist .\FoundData.txt del .\FoundData.txt
SET DataFileName=
SET LineData=
SET FoundData=
SETLOCAL ENABLEDELAYEDEXPANSION
FOR /F %%A IN (.\Files.txt) DO (
SET DataFileName=%%A
FOR /F "tokens=1,2* " %%B IN (!DataFileName!) DO (
rem use the following line to get just the first word on the line
rem SET LineData=%%B
rem use the following line to get the entire line
SET LineData=%%B %%C %%D
rem determine if the line contains "DATA" (case insensitive) and if so capture it
if "%FoundData%"=="" ( ECHO !LineData!|FIND /I "DATA">Nul && (SET FoundData=!LineData! ) || (SET FoundData=) )
rem if the line contained the data we want output it to the output file
IF NOT "!FoundData!"=="" (
(ECHO !FoundData! !DataFileName!>>.\FoundData.txt)
)
)
SET LineData=
SET FoundData=
)
set DataFileName=
)
ENDLOCAL
if not exist .\FoundData.txt echo No data found>.\FoundData.txt
start notepad .\FoundData.txt

Answer 3

You could try the following:
#echo off
for %%F in (".\tape*.txt") do (
for /F "delims=:" %%N in ('findstr /N /X /C:"Header" "%%~F"') do (
call :SUB "%%~F" %%N
)
)
exit /B
:SUB
set /A "SKIP=%~2+3"
for /F "skip=%SKIP% usebackq delims=" %%L in ("%~1") do (
echo(%%L %~n1
)
exit /B
Here is an alternative approach:
#echo off
for %%F in (".\tape*.txt") do (
for /F %%C in ('^< "%%~F" find /C /V ""') do (
set /A "POS=0" & set "NAME=%%~nF"
< "%%~F" (
setlocal EnableDelayedExpansion
for /L %%I in (1,1,%%C) do (
set "LINE=" & set /P LINE=""
if "!LINE!"=="Header" (
set /A "POS=%%I+3"
)
if !POS! GTR 0 if %%I GTR !POS! (
echo(!LINE! !NAME!
)
)
endlocal
)
)
)