rdump -V (return code: 1)
rdump: invalid option -- '-'
rdump 0.4b46 (using libext2fs 1.43.5 of 04-Aug-2017)
usage: rdump [-level#] [-acmMnqSuv] [-A file] [-B records] [-b blocksize]
[-d density] [-D file] [-e inode#,inode#,...] [-E file]
[-f file] [-h level] [-I nr errors] [-j zlevel] [-Q file]
[-s feet] [-T date] [-y] [-z zlevel] filesystem
rdump [-W | -w]
rdump -HELP (return code: 1)
rdump: invalid option -- '-'
rdump 0.4b46 (using libext2fs 1.43.5 of 04-Aug-2017)
usage: rdump [-level#] [-acmMnqSuv] [-A file] [-B records] [-b blocksize]
[-d density] [-D file] [-e inode#,inode#,...] [-E file]
[-f file] [-h level] [-I nr errors] [-j zlevel] [-Q file]
[-s feet] [-T date] [-y] [-z zlevel] filesystem
rdump [-W | -w]