{autotoc enabled=no}
There are several ways to check.
Here are a few common ones:
# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext4 20G 7.8G 11G 43% /
tmpfs tmpfs 7.8G 72K 7.8G 1% /dev/shm
/dev/sda1 ext4 190M 89M 92M 50% /boot
/dev/sda5 ext4 89G 56G 29G 67% /home
# mount
/dev/sda2 on / type ext4 (rw)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
/dev/sda5 on /home type ext4 (rw)
# cat /etc/fstab
UUID=1-2-3-4-5 / ext4 defaults 1 1
UUID=6-7-8-9-0 /boot ext4 defaults 1 2
UUID=1-3-4-6-8 /home ext4 defaults 1 2
UUID=3-4-5-6-7 swap swap defaults 0 0
