write to standard output (even if it is the console); keep original files (disable `--rm`).
* `-o FILE`:
save result into `FILE`.
- This command is in conflict with `-c`.
- If both are present on the command line, the last expressed one wins.
+ Note that this operation is in conflict with `-c`.
+ If both operations are present on the command line, the last expressed one wins.
* `--[no-]sparse`:
enable / disable sparse FS support,
to make files with many zeroes smaller on disk.