This file displays a list of the file system types currently supported by the kernel. Sample output from a generic
/proc/filesystemsfile looks similar to the following:
nodev sysfs nodev rootfs nodev bdev nodev proc nodev sockfs nodev binfmt_misc nodev usbfs nodev usbdevfs nodev futexfs nodev tmpfs nodev pipefs nodev eventpollfs nodev devpts ext2 nodev ramfs nodev hugetlbfs iso9660 nodev mqueue ext3 nodev rpc_pipefs nodev autofs
The first column signifies whether the file system is mounted on a block device. Those beginning with
nodevare not mounted on a device. The second column lists the names of the file systems supported.
mountcommand cycles through the file systems listed here when one is not specified as an argument.