1、df -h 查看系统磁盘设备，默认KB为单位
xiao@redf:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 96M 816K 95M 1% /run
/dev/sda2 30G 2.6G 26G 10% /
tmpfs 479M 0 479M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 96M 4.0K 96M 1% /run/user/1000
2、df -ah 查看全部文件系统
xiao@redf:~$ df -ah
Filesystem Size Used Avail Use% Mounted on
sysfs 0 0 0 - /sys
proc 0 0 0 - /proc
udev 423M 0 423M 0% /dev
devpts 0 0 0 - /dev/pts
tmpfs 96M 816K 95M 1% /run
/dev/sda2 30G 2.6G 26G 10% /
securityfs 0 0 0 - /sys/kernel/security
tmpfs 479M 0 479M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
cgroup2 0 0 0 - /sys/fs/cgroup
pstore 0 0 0 - /sys/fs/pstore
bpf 0 0 0 - /sys/fs/bpf
systemd-1 - - - - /proc/sys/fs/binfmt_misc
hugetlbfs 0 0 0 - /dev/hugepages
mqueue 0 0 0 - /dev/mqueue
debugfs 0 0 0 - /sys/kernel/debug
tracefs 0 0 0 - /sys/kernel/tracing
fusectl 0 0 0 - /sys/fs/fuse/connections
configfs 0 0 0 - /sys/kernel/config
none 0 0 0 - /run/credentials/systemd-sysusers.service
binfmt_misc 0 0 0 - /proc/sys/fs/binfmt_misc
tmpfs 96M 4.0K 96M 1% /run/user/1000
3、查看指定目录的可用空间两
xiao@redf:~$ df -h /home
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 30G 2.6G 26G 10% /
