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DOS批处理 & 脚本技术（批处理室） » How can a batch file compare two text files and output the lines that are different?

Floor1　adslcool	Posted 2010-04-21 19:26
新手上路　Posts 10　Credits 10
Requirement: for lines that exist in A.txt, search through B.txt line by line, and then output the ones not found to 结果.txt Example: Contents of a.txt ___________________________________ aaa bbb vwh ddd eee ... Thousands more lines omitted below ____________________________________ Contents of b.txt ____________________________________ 000 aaa q23 FFF ggg sdd jjk yyu eee ... Thousands more lines omitted below ____________________________________ Requirement: for lines that exist in A.txt, search through B.txt line by line, and then output the ones not found to 结果.txt [ Last edited by adslcool on 2010-4-21 at 19:44 ]

Floor2　adslcool	Posted 2010-04-21 19:27
新手上路　Posts 10　Credits 10
I need it urgently, handling thousands of records is really too hard

Floor3　Hanyeguxing	Posted 2010-04-21 19:35
银牌会员　Posts 897　Credits 1,039　From 在地狱中仰望天堂

Floor4　adslcool	Posted 2010-04-21 19:39
新手上路　Posts 10　Credits 10
Requirement: for lines that exist in A.txt, search through B.txt line by line, and then output the ones not found to 结果.txt

Floor6　Hanyeguxing	Posted 2010-04-21 20:17
银牌会员　Posts 897　Credits 1,039　From 在地狱中仰望天堂
for /f "delims=" %%i in (a.txt) do set "%%i==" for /f "delims=" %%i in (b.txt) do if not defined %%i >>c.txt echo.%%i Using a.txt as the sample for comparison, if the same line does not exist in b.txt then output it to c.txt

Floor7　Hanyeguxing	Posted 2010-04-21 20:21
银牌会员　Posts 897　Credits 1,039　From 在地狱中仰望天堂
for /f "delims=" %%i in (a.txt) do set "%%i==" for /f "delims=" %%i in (b.txt) do if defined %%i >>c.txt echo.%%i Using a.txt as the sample for comparison, if the same line exists in b.txt then output it to c.txt