findmnt

Show filesystems:

$ findmnt
TARGET                        SOURCE      FSTYPE          OPTIONS
/                             /dev/dm-1   ext4            rw,relatime,errors=remount-ro,data=ordered
├─/sys                        sysfs       sysfs           rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup                        tmpfs           rw,relatime,size=4k,mode=755
│ │ └─/sys/fs/cgroup/systemd  systemd     cgroup          rw,nosuid,nodev,noexec,relatime,name=systemd
│ ├─/sys/fs/fuse/connections              fusectl         rw,relatime
│ ├─/sys/kernel/debug                     debugfs         rw,relatime
│ ├─/sys/kernel/security                  securityfs      rw,relatime
│ ├─/sys/firmware/efi/efivars             efivarfs        rw,relatime
│ └─/sys/fs/pstore                        pstore          rw,relatime
├─/proc                       proc        proc            rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc  binfmt_misc binfmt_misc     rw,nosuid,nodev,noexec,relatime
├─/dev                        udev        devtmpfs        rw,relatime,size=8113024k,nr_inodes=2028256,mode=755
│ └─/dev/pts                  devpts      devpts          rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
├─/run                        tmpfs       tmpfs           rw,nosuid,noexec,relatime,size=1625608k,mode=755
│ ├─/run/lock                             tmpfs           rw,nosuid,nodev,noexec,relatime,size=5120k
│ ├─/run/shm                              tmpfs           rw,nosuid,nodev,relatime
│ └─/run/user                             tmpfs           rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755
│   └─/run/user/1000/gvfs     gvfsd-fuse  fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000
└─/boot                       /dev/sda2   ext2            rw,relatime
  └─/boot/efi                 /dev/sda1   vfat            rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro

Show tmpfs filesystems:

$ findmnt -t tmpfs
TARGET         SOURCE FSTYPE OPTIONS
/run           tmpfs  tmpfs  rw,nosuid,noexec,relatime,size=1625608k,mode=755
/sys/fs/cgroup        tmpfs  rw,relatime,size=4k,mode=755
/run/lock             tmpfs  rw,nosuid,nodev,noexec,relatime,size=5120k
/run/shm              tmpfs  rw,nosuid,nodev,relatime
/run/user             tmpfs  rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755

Show submounts of /sys:

$ findmnt /sys -R
TARGET                      SOURCE  FSTYPE     OPTIONS
/sys                        sysfs   sysfs      rw,nosuid,nodev,noexec,relatime
├─/sys/fs/cgroup                    tmpfs      rw,relatime,size=4k,mode=755
│ └─/sys/fs/cgroup/systemd  systemd cgroup     rw,nosuid,nodev,noexec,relatime,name=systemd
├─/sys/fs/fuse/connections          fusectl    rw,relatime
├─/sys/kernel/debug                 debugfs    rw,relatime
├─/sys/kernel/security              securityfs rw,relatime
├─/sys/firmware/efi/efivars         efivarfs   rw,relatime
└─/sys/fs/pstore                    pstore     rw,relatime

List filesystem mountpoints:

$ findmnt -ln -o TARGET | sort
/
/boot
/boot/efi
/dev
/dev/pts
/proc
/proc/sys/fs/binfmt_misc
/run
/run/lock
/run/shm
/run/user
/run/user/1000/gvfs
/sys
/sys/firmware/efi/efivars
/sys/fs/cgroup
/sys/fs/cgroup/systemd
/sys/fs/fuse/connections
/sys/fs/pstore
/sys/kernel/debug
/sys/kernel/security

Options

-t, --types list

Show filesystems of given types

-R, --submounts

Show submounts of selected filesystem

-o, --output list

Output columns to display

-l, --list

Use list output format

-n, --noheadings

Suppress columns headings