Windows批处理文件重命名：如何保留文件名最后8个字符

Got it, let's work through this batch renaming problem. You already have the prefix and date handling sorted, so the main trick here is using batch's built-in string manipulation to grab the last 8 characters of your filename. Here's a complete solution tailored to your needs:

Step-by-Step Script #

@echo off
setlocal enabledelayedexpansion

:: Loop through all matching Rapp_*.tif files
for %%f in (Rapp_*.tif) do (
    :: Extract the core filename (without extension)
    set "original_filename=%%~nf"
    :: Grab the LAST 8 characters of the full filename (including extension) - this is your "_001.tif" part
    set "suffix=%%~nxf:~-8"
    
    :: Extract the raw date string from the original filename (adjust the indices if your date position differs)
    :: Original example: "Rapp_20220628150328_001" → raw date is "20220628" (starts at index 5, 8 characters long)
    set "raw_date=!original_filename:~5,8!"
    
    :: Split raw date into year, month, day
    set "year=!raw_date:~0,4!"
    set "month=!raw_date:~4,2!"
    set "day=!raw_date:~6,2!"
    
    :: Format the date into YYYY_MM_GG
    set "formatted_date=!year!_!month!_!day!"
    
    :: Build the new filename
    set "new_filename=Rapp_!formatted_date!!suffix!"
    
    :: Execute the rename (add echo before ren to test first if you want)
    ren "%%f" "!new_filename!"
)

echo Renaming completed successfully!
endlocal

Key Details Explained #

• setlocal enabledelayedexpansion: This is critical for variables inside the for loop to update correctly. Without it, batch would evaluate all variables once at the start of the loop instead of per-file.
• %%~nxf:~-8: The :~-8 syntax tells batch to take the last 8 characters of the full filename (name + extension). Exactly what you need to preserve _001.tif.
• Date Extraction: !original_filename:~5,8! pulls the 8-character date string starting at index 5 (since "Rapp_" is 5 characters long). Adjust these numbers if your original filename structure varies.
• Safety Tip: Add echo before ren (like echo ren "%%f" "!new_filename!") to preview changes without actually renaming files first.

Example Output #

For your test file Rapp_20220628150328_001.tif, the script will generate:
Rapp_2022_06_28_001.tif

内容的提问来源于stack exchange，提问作者Daniele