tldr/pages/common/mmv.md

# mmv

> Move and rename files in bulk.

- Rename all files with a certain extension to a different extension:

`mmv "*{{.old_extension}}" "#1{{.new_extension}}"`

- Copy `report6part4.txt` to `./french/rapport6partie4.txt` along with all similarly named files:

`mmv -c "{{report*part*.txt}}" "{{./french/rapport#1partie#2.txt}}"`

- Append all `.txt` files into one file:

`mmv -a "{{*.txt}}" "{{all.txt}}"`

- Convert dates in filenames from "M-D-Y" format to "D-M-Y" format:

`mmv "{{[0-1][0-9]-[0-3][0-9]-[0-9][0-9][0-9][0-9].txt}}" "{{#3#4-#1#2-#5#6#7#8.txt}}"`