DosTips.com

Code: Select all

file1=openfile in1.txt
file2=openfile in2.txt
file_out=openfile out.txt

while not file1.EOF and not file2.EOF
{ // in each loop, read next line from file1 and file2
   line_in_file1=file1.ReadLine
   line_in_file2=file2.ReadLine
   
   // two lines are not same 
   if line_in_file1 <> line_in_file2
   {
      // line_in_file1 and line_in_file2 are made into
      // one line and append the line to end of out.txt
      file_out.append_line( line_in_file1 & line_in_file2 )
   }
}

close file1
close file2
close file_out

Code: Select all

@echo off

setlocal DisableDelayedExpansion
set "in_file1=txt1.txt"
set "in_file2=txt2.txt"
set "out_file=out.txt"

<"%in_file1%" >"%out_file%" (
  for /f "delims=" %%i in ('findstr /n "^" "%in_file2%"') do (
    set "line2=%%i"

    setlocal EnableDelayedExpansion
    set "line1=" &set /p "line1="
    if "!line1!" neq "!line2:*:=!" (
      for /f "delims=:" %%j in ("!line2!") do echo line %%j: !line1! ^<--^> !line2:*:=!
    )
    endlocal
  )
)