如何批量重命名\Images文件夹文件，仅保留最后下划线后数字及后缀？

阿华AIGC实验室

2026-5-28

Hey there! Let me walk you through a few reliable ways to batch rename those image files exactly how you want—keeping only the number after the last underscore plus the file extension.

方法1：Windows PowerShell

This is super straightforward if you're on Windows. Here's what to do:

Open PowerShell and navigate to your Images folder using cd path\to\your\Images
Run this command (add -WhatIf at the end first to preview changes without actually renaming):

Get-ChildItem -Filter *.png | Rename-Item -NewName { $_.Name -split '_' | Select-Object -Last 1 }

解释：

Get-ChildItem -Filter *.png grabs all PNG files in the folder
-split '_' breaks each filename into parts using underscores as separators
Select-Object -Last 1 picks the last part (which is your target number + extension)

方法2：macOS/Linux 终端

If you're on a Unix-like system, you have a couple options:

选项A：使用`rename`命令（大部分系统预装）

Run this in your Images directory (test first with the -n flag to preview):

rename -n 's/.*_(\d+\.png)/$1/' *.png

Once you're happy with the preview, remove the -n to apply the changes:

rename 's/.*_(\d+\.png)/$1/' *.png

解释：

The regex .*_ matches everything up to the last underscore
(\d+\.png) captures the number sequence followed by .png
$1 uses that captured group as the new filename

选项B：使用`mv` + `awk`（更兼容，无`rename`也能用）

Run this loop (again, replace mv with echo mv first to preview):

for file in *.png; do
  new_name=$(echo "$file" | awk -F '_' '{print $NF}')
  mv "$file" "$new_name"
done

解释：

awk -F '_' '{print $NF}' splits the filename by underscores and prints the last field

方法3：Python 脚本（跨平台）

If you prefer a script that works everywhere, save this as rename_images.py in your Images folder:

import os

folder_path = os.getcwd()  # Uses current directory; you can replace with your path
for filename in os.listdir(folder_path):
    if filename.endswith(".png"):
        # Split filename by underscores and take the last part
        new_name = filename.split("_")[-1]
        # Avoid overwriting existing files (optional but safe)
        if not os.path.exists(new_name):
            os.rename(os.path.join(folder_path, filename), os.path.join(folder_path, new_name))
        else:
            print(f"Skipping {filename} - {new_name} already exists")

Then run it with python rename_images.py from the terminal/PowerShell.

内容的提问来源于stack exchange，提问作者James Smith