mmv:tldr:fd753

The command you provided is using the "mmv" (multiple move) command to rename files in a directory. Here is the explanation of each part of the command:

1. mmv: It is a command-line utility used to move or rename multiple files in one step.

2. -c: This option serves as a confirmation prompt before executing each move.

3. "${reportpart-txt}": This is a pattern representing the source files to be renamed. It uses wildcards to match files with specific names. It specifies that the source files should have "report" as the prefix, followed by any characters, then "part" in the filename, and ending with ".txt".

4. "${--french-rapport#1partie#2-txt}": This is the pattern that represents how the files should be renamed. It follows a similar format with wildcards. It renames the files by replacing the "report" prefix with "french-rapport", and replaces the "part" in the filename with "partie". The "#1" and "#2" represent the sequence and order of the characters being replaced. Finally, it adds ".txt" as the new file extension.

To summarize, the mmv command with the provided parameters will ask for confirmation before renaming files that match the source pattern. It will replace the "report" prefix with "french-rapport" and replace "part" in the filename with "partie", ultimately changing the file names from "reportpart.txt" to "french-rapportpartie.txt".