mmv — Move and rename files in bulk. More information: <https://manned.org/mmv.1>.

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|--copy]}} "{{report*part*.txt}}" "{{./french/rapport#1partie#2.txt}}"

Append all `.txt` files into one file

mmv {{[-a|--append]}} "{{*.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}}"