Rename all files in a directory with a Windows batch script

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A FOR statement to loop through the names (type FOR /? for help), and string search and replace (type SET /? for help).

@echo off
setlocal enableDelayedExpansion
for %%F in (*120x90.jpg) do (
  set "name=%%F"
  ren "!name!" "!name:120x90=67x100!"
)

UPDATE – 2012-11-07

I’ve investigated how the RENAME command deals with wildcards: How does the Windows RENAME command interpret wildcards?

It turns out that this particular problem can be very easily solved using the RENAME command without any need for a batch script.

ren *_120x90.jpg *_67x100.*

The number of characters after the _ does not matter. The rename would still work properly if 120x90 became x or xxxxxxxxxx. The important aspect of this problem is that the entire text between the last _ and the . is replaced.

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