This example demonstrates a shell one-liner that renames every file in the current directory to the MD5 hash of its filename while preserving the original file extension. The script iterates over each file with a `for` loop, computes the hash using `md5sum` on the filename with `echo -n` to avoid a trailing newline, and then prints the original and new names with `echo`. It uses parameter expansion to strip the hash’s trailing metadata and extract the extension via `${i##*.}`. The output shows the mapping without actually performing the rename, as the command only prints the `--` separated pair.