How to find out what filesystems Linux kernel supports

To find out what filesystems the Linux kernel supports, you can use the cat command to display the contents of the /proc/filesystems file. This file lists all the filesystems that the Linux kernel is able to mount and support.

For example:

$ cat /proc/filesystems
nodev   sysfs
nodev   rootfs
nodev   ramfs
nodev   bdev
nodev   proc
nodev   cgroup
nodev   cpuset
nodev   tmpfs
nodev   devtmpfs
        ext2
        ext3
        ext4
        vfat
        msdos
        umsdos
        isofs
        ntfs
        fuseblk
        fuse
        fusectl

The /proc/filesystems file lists all the filesystems that the kernel is able to mount, with nodev indicating that the filesystem does not have a corresponding block device. The filesystems that are listed without the nodev prefix are regular filesystems that can be mounted on a block device, such as a hard drive or a USB flash drive.

Note that the list of filesystems in the /proc/filesystems file may vary depending on the Linux kernel and the installed filesystem drivers. Some filesystems may not be listed if they are not compiled into the kernel, or if the necessary kernel modules are not loaded.