Linux显示包含全部的文件系统

youhaidong@youhaidong-ThinkPad-Edge-E545:~$ df -a
文件系统       1K-blocks    已用     可用 已用% 挂载点
/dev/sda8       19554840 7331956 11206500   40% /
proc                   0       0        0     - /proc
sysfs                  0       0        0     - /sys
none                   4       0        4    0% /sys/fs/cgroup
none                   0       0        0     - /sys/fs/fuse/connections
none                   0       0        0     - /sys/kernel/debug
none                   0       0        0     - /sys/kernel/security
udev             1540740       4  1540736    1% /dev
devpts                 0       0        0     - /dev/pts
tmpfs             310308    1472   308836    1% /run
none                5120       0     5120    0% /run/lock
none             1551532     152  1551380    1% /run/shm
none              102400      36   102364    1% /run/user
none                   0       0        0     - /sys/fs/pstore
/dev/sda10      49082176 2554860 44010992    6% /home
/dev/sda9         967320   64652   836316    8% /boot
systemd                0       0        0     - /sys/fs/cgroup/systemd
gvfsd-fuse             0       0        0     - /run/user/1000/gvfs
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ df --all
文件系统       1K-blocks    已用     可用 已用% 挂载点
/dev/sda8       19554840 7379372 11159084   40% /
proc                   0       0        0     - /proc
sysfs                  0       0        0     - /sys
none                   4       0        4    0% /sys/fs/cgroup
none                   0       0        0     - /sys/fs/fuse/connections
none                   0       0        0     - /sys/kernel/debug
none                   0       0        0     - /sys/kernel/security
udev             1540740       4  1540736    1% /dev
devpts                 0       0        0     - /dev/pts
tmpfs             310308    1472   308836    1% /run
none                5120       0     5120    0% /run/lock
none             1551532     156  1551376    1% /run/shm
none              102400      36   102364    1% /run/user
none                   0       0        0     - /sys/fs/pstore
/dev/sda10      49082176 2556056 44009796    6% /home
/dev/sda9         967320   64652   836316    8% /boot
systemd                0       0        0     - /sys/fs/cgroup/systemd
gvfsd-fuse             0       0        0     - /run/user/1000/gvfs
youhaidong@youhaidong-ThinkPad-Edge-E545:~$