批处理文件-查找文件并替换

Question

Basically I have created a batch file which copies a file within FOLDER A and then renames the file with the date on the end and pastes it into FOLDER C .

Before this takes place I am looking to find out how I would set up a FIND function to search through FOLDER B to see if it has a file with the same name.

If it does contain the same name as the file in FOLDER A then I want it to copy that file add the date on the end and paste it into FOLDER C .

Lets say:

• *wav file is in FOLDER A
• FIND *wav file in FOLDER -B to see if it exists.
• If the *wav file does exist
• then copy this to FOLDER C
• then re-name *wav with the date on the end

Hope this makes sense.

Answer 1

IF EXIST

cmd has a builtin IF EXIST that checks to see if a file exists, and the analagous IF NOT EXIST . (See IF /? or ss64.com ) Something like this would do what you describe.

IF NOT EXIST "%TARGET_FILE%" COPY "%SOURCE_FILE%" "%TARGET_FILE%"

File/Path Parsing

cmd has some means of parsing paths, however, all the useful features are contained within the FOR command (See FOR /? or ss64.com ).

I usually start with a typical environment variable, eg %SOURCE_FILE% , give it to FOR and allow FOR 's substitution behavior to get either the parent dir, filename, extension, etc.

Suppose you wanted the base name of the file (no containing directory). You could accomplish that like this:

FOR /F "tokens=*" %%f IN ("%SOURCE_FILE%") DO SET "SOURCE_FILE_BASE=%%~ff"

Now, SOURCE_FILE_BASE would contain the base name of the file. (Note: the syntax of FOR changes when you use it in a script vs at the interactive shell. The use of %% is what a script needs.)

Combined

Based on what you describe, supposing you have a path to a file saved in SOURCE_FILE and the directory where you wish to copy the file to, TARGET_DIR , you could accomplish what you describe by doing something like:

FOR /F "tokens=*" %%f IN ("%SOURCE_FILE%") DO SET "SOURCE_FILE_BASE=%%~ff"
SET "TARGET_FILE=%TARGET_DIR%\%SOURCE_FILE_BASE%"
IF NOT EXIST "%TARGET_FILE%" COPY "%SOURCE_FILE%" "%TARGET_FILE%"