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DOS批处理 & 脚本技术（批处理室） » How to "simplify" the following batch processing with a FOR loop? (How to pass >> to a variable?)

Floor1　GOTOmsdos	Posted 2005-04-16 00:00
铂金会员　Posts 1,827　Credits 5,154
How to use a FOR loop to "simplify" the following batch processing to write the drive letters in findd.txt to the drive.txt file (for WBAT to call)? find "C:\" findd.txt >nul if not errorlevel 1 echo C:>>drive.txt find "D:\" findd.txt >nul if not errorlevel 1 echo D:>>drive.txt find "E:\" findd.txt >nul ....

Floor2　willsort	Posted 2005-04-16 00:00
元老会员　Posts 1,512　Credits 4,432
Re GOTOmsdos: Although using a FOR loop is also achievable, I do not recommend using it because it is not flexible in controlling internal processes; I suggest you use a command-line loop. I once wrote several similar programs for兄 walu, and you can refer to and modify them using the following links: http://bbs.cn-dos.net/dispbbs.asp?boardid=12&id=9637 http://bbs.cn-dos.net/dispbbs.asp?boardid=9&id=11963 http://bbs.cn-dos.net/dispbbs.asp?boardid=12&id=14552 http://bbs.cn-dos.net/dispbbs.asp?BoardID=9&ID=14512

Floor3　chenhui530	Posted 2005-04-16 00:00
高级用户　Posts 273　Credits 772
In pure DOS, it can't be nested like this. Looking at the building's program, it should be under pure DOS, so SHIFT should be used.

Floor4　GOTOmsdos	Posted 2005-04-16 00:00
铂金会员　Posts 1,827　Credits 5,154
Thanks for the reminder, just use SHIFT with a parameter. It's really difficult with FOR!drive.bat: @echo off :loop if "%1"=="" goto end find "%1" findd.txt>nul if not errorlevel 1 echo %1>>drive.txt shift goto loop :end Input: drive c: d: e: ....