go build -o extChange ./cmd
If you want to rename files in ./movie from .7zz to .7z, run this cmd:
extChange -R 7zz -T 7z -D movie
-R: source ext name, supported Regex pattern.
-T: new ext name
-D: target directory, absPath or relativePath is both supported
This operation will overwrite the source file, also is equal to rename file. So be careful.