Batch script for copying files based on name

问题

Basically I want to write a little batch script that does the following - I have two folders, A and B... A has 10 files and B has 100. I want to compare the names of the files in each folder and if any in B have the same name as in A, then to copy them to folder A and overwrite the original file.

I was trying to start off by doing a "for" command on folder A but then I would have to follow that with an IF to compare the filenames which I have no idea how to express correctly

    for /r "C:\folderA" %%a in (*.filetype) do (...)

Sry but I am useless with batch scripting. I found a couple of threads covering similar questions, but rly didn't follow the answers enough to help.

Is this difficult? The other threads comparing two filenames looked kinda complicated.

Thanks for any help :)

回答1:

Try this:

xcopy /s /u /y /i /r /c "C:\folderB\*.filetype" "C:\folderA"

/s copies folders and subfolders
/u copies only file that pre-exist in both folders
/y suppresses prompts on overwriting files
/i tells xcopy that destination is a folder
/r ignores READONLY attribute just in case (this is optional)
/c continues copying even if errors occur (this is optional)

More information on xcopy can be found here (or xcopy /?)

If that does not work for you then something like this should do:

for /r "C:\folderA" %%a in (*.filetype) do if exist "C:\folderB\%%~nxa" copy /y "C:\folderB\%%~nxa" "C:\folderA\%%~nxa"

Here is what it does:

if exist checks if a file exists
- the path it checks is composed from folderA path and name and extension of the file found in folderB
copy /y copies file overwriting existing one
- from original file found in folderB
- to similar-named file found in folderA

%%~dpnxa syntax goes like this: