findmnt -t ext4

If you’re only interested in block devices, you can list them with lsblk command:

lsblk

How to Mount File Systems on Linux

You can mount file systems for a single session using the mount command, and permanently by editing /etc/fstab. Mounting needs to be done by an administrator, either by logging in as root or by using the sudo command. There are some cases where mounting is done automatically, like when you insert a USB flash drive. Here are a few examples using the mount command, plus the preparatory mkdir command to create the mount point.

Mount a Windows Floppy Disk

    This command is only necessary if the /mnt/floppy directory doesn’t already exist.

mkdir /mnt/floopy

 Use mount with the -t flag (short for “type”) to specify MSDOS as the file system.

mount -t msdos /dev/fd0 /mnt/floopy

The contents of the floppy disk in /dev/fd0 should now be accessible from /mnt/floppy.