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 "reportpart.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"