Linux显示指定区块大小为1048576字节

youhaidong@youhaidong-ThinkPad-Edge-E545:~$ df -m
文件系统       1M-blocks  已用  可用 已用% 挂载点
/dev/sda8          19097  7283 10822   41% /
none                   1     0     1    0% /sys/fs/cgroup
udev                1505     1  1505    1% /dev
tmpfs                304     2   302    1% /run
none                   5     0     5    0% /run/lock
none                1516     1  1516    1% /run/shm
none                 100     1   100    1% /run/user
/dev/sda10         47932  2497 42979    6% /home
/dev/sda9            945    64   817    8% /boot
youhaidong@youhaidong-ThinkPad-Edge-E545:~$ df --megabytes
df: warning: long option '--megabytes' is deprecated and will soon be removed
文件系统       1M-blocks  已用  可用 已用% 挂载点
/dev/sda8          19097  7283 10822   41% /
none                   1     0     1    0% /sys/fs/cgroup
udev                1505     1  1505    1% /dev
tmpfs                304     2   302    1% /run
none                   5     0     5    0% /run/lock
none                1516     1  1516    1% /run/shm
none                 100     1   100    1% /run/user
/dev/sda10         47932  2497 42979    6% /home
/dev/sda9            945    64   817    8% /boot
youhaidong@youhaidong-ThinkPad-Edge-E545:~$