The exit code returned by mkfs is 0 on success and 1 on failure.
In actuality, mkfs is simply a front-end for the various file system builders (mkfs.fstype) available under Linux. The file system-specific builder is searched for in a number of directories like perhaps /sbin, /sbin/fs, /sbin/fs.d, /etc/fs, /etc (the precise list is defined at compile time but at least contains /sbin and /sbin/fs), and finally in the directories listed in the PATH environment variable. Please see the file system-specific builder manual pages for further details.
|-V||Produce verbose output, including all file system-specific commands that are executed. Specifying this option more than once inhibits execution of any file system-specific commands. This is really only useful for testing.|
|Specifies the type of file system to be built. If not specified, the default file system type (currently ext2) is used.|
|File system-specific options to be passed to the real file system builder. Although not guaranteed, the following options are supported by most file system builders.|
|-c||Check the device for bad blocks before building the file system.|
|Read the bad blocks list from filename|
|-v||Produce verbose output.|