-V, --version Print the version number of fsck.erofs and exit.
"-d " # Specify the level of debugging messages. The default is 2, which shows basic warning messages.
-p Print total compression ratio of all files including compressed and non-compressed files.
"--device=" path Specify an extra blob device to be used together. You may give multiple --device options in the correct order.
"--extract" "[=directory]" Test to extract the whole file system. It scans all inode data, including compressed inode data, which leads to more I/O and CPU load, so it might take a long time depending on the image size. Optionally extract contents of the IMAGE to directory.
-h, --help Display help string and exit.
-a, -A, -y These options do nothing at all; they are provided only for compatibility with the fsck programs of other filesystems.