df
Statistics overall disk space df command lists the file system can be used to view disk usage and free space.
format
df [options] parameters
Note: By default, if you do not add any options, disk space is displayed in units of 1KB.
[root@linus ~]# df #因为我是使用的xshell连接，所以能够显示中文内容
文件系统 1K-块 已用 可用 已用% 挂载点
/dev/mapper/centos-root 52403200 4563668 47839532 9% /
devtmpfs 917604 0 917604 0% /dev
tmpfs 933524 0 933524 0% /dev/shm
tmpfs 933524 9288 924236 1% /run
tmpfs 933524 0 933524 0% /sys/fs/cgroup
/dev/sda1 1038336 182368 855968 18% /boot
/dev/mapper/centos-home 49250820 33052 49217768 1% /home
tmpfs 186708 12 186696 1% /run/user/42
tmpfs 186708 0 186708 0% /run/user/0
View in the system, followed by Filesystem, 1K-blocks, Used, Available, Use%, Mounted on
Filesystem: The representative of the file system which partition, lists the device name.
1K-blocks: Description display unit is 1KB, can be used to change the unit -m -h or size, may be provided with -B.
Used: size of the disk space has been used.
Available: the size of the remaining space.
Use%: disk usage. If the utilization rate above 90%, you need to pay attention, to avoid the emergence of system disk capacity shortage problem, especially for file contents increase faster situations (such as / home, / var / spool / mail , etc.).
Mounted on: the disk mounted directory.
Note: You can also use df add a file or directory to see the use of the directory where the disk.
[root@linus ~]# df /etc/
文件系统 1K-块 已用 可用 已用% 挂载点
/dev/mapper/centos-root 52403200 4564580 47838620 9% /
Options
-a: -all, show all file systems, including the virtual file system
-B: -block-size, specify the size of the unit. For example 1K, 1M etc.
-h: -human-readable, in the most appropriate unit display
-H: -si, -h, and as parameters, but not in 1024, but 1000, i.e. 1k = 1000, instead of 1k = 1024
-i: -inodes, no hard disk capacity, but in the inode number (nodes) to display
-k: KB displays each file system capacity, the equivalent-size = 1K -block
-m: each displayed in KB capacity file system, size = 1M-equivalent -block
the -l: -local, show only the local file system
-no-sync: before using the statistical information does not invoke sync command (default)
-sync: call sync command before using the statistical information
-t: -type = tYPE, display only the specified type of file system
-T: -print-type, displaying the file system type
-x: -exclude-type = tYPE, do not display the specified type of file system
Simple Case
Note: This case just to name a few common options, and the rest on their own practice
[root@linus ~]# df -B g #指定单位大小为：GB，也可以指定KB，MB等
文件系统 1G-块 已用 可用 已用% 挂载点
/dev/mapper/centos-root 50G 5G 46G 9% /
devtmpfs 1G 0G 1G 0% /dev
tmpfs 1G 0G 1G 0% /dev/shm
tmpfs 1G 1G 1G 1% /run
tmpfs 1G 0G 1G 0% /sys/fs/cgroup
/dev/sda1 1G 1G 1G 18% /boot
/dev/mapper/centos-home 47G 1G 47G 1% /home
tmpfs 1G 1G 1G 1% /run/user/0
/dev/sr0 5G 5G 0G 100% /run/media/ro
[root@linus ~]# df -h #以合适的单位显示磁盘空间
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 50G 4.4G 46G 9% /
devtmpfs 897M 0 897M 0% /dev
tmpfs 912M 0 912M 0% /dev/shm
tmpfs 912M 9.1M 903M 1% /run
tmpfs 912M 0 912M 0% /sys/fs/cgroup
/dev/sda1 1014M 179M 836M 18% /boot
/dev/mapper/centos-home 47G 33M 47G 1% /home
tmpfs 183M 44K 183M 1% /run/user/0
/dev/sr0 4.3G 4.3G 0 100% /run/media/ro
[root@linus ~]# df -T #显示文件系统类型
文件系统 类型 1K-块 已用 可用 已用% 挂载点
/dev/mapper/centos-root xfs 52403200 4575168 47828032 9% /
devtmpfs devtmpfs 917604 0 917604 0% /dev
tmpfs tmpfs 933524 0 933524 0% /dev/shm
tmpfs tmpfs 933524 9252 924272 1% /run
tmpfs tmpfs 933524 0 933524 0% /sys/fs/cgroup
/dev/sda1 xfs 1038336 182368 855968 18% /boot
/dev/mapper/centos-home xfs 49250820 33052 49217768 1% /home
tmpfs tmpfs 186708 44 186664 1% /run/user/0
/dev/sr0 iso9660 4414592 4414592 0 100% /run/media/root/CentOS 7 x86_64
[root@linus ~]# df -l #只显示本地文件系统
文件系统 1K-块 已用 可用 已用% 挂载点
/dev/mapper/centos-root 52403200 4575172 47828028 9% /
devtmpfs 917604 0 917604 0% /dev
tmpfs 933524 0 933524 0% /dev/shm
tmpfs 933524 9252 924272 1% /run
tmpfs 933524 0 933524 0% /sys/fs/cgroup
/dev/sda1 1038336 182368 855968 18% /boot
/dev/mapper/centos-home 49250820 33052 49217768 1% /home
tmpfs 186708 44 186664 1% /run/user/0
/dev/sr0 4414592 4414592 0 100% /run/media/root/CentOS 7 x86_64
Usually we will use these options together, for example:
[root@linus ~]# df -hT #以合适的单位显示磁盘使用情况，并显示文件系统
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root xfs 50G 4.4G 46G 9% /
devtmpfs devtmpfs 897M 0 897M 0% /dev
tmpfs tmpfs 912M 0 912M 0% /dev/shm
tmpfs tmpfs 912M 9.1M 903M 1% /run
tmpfs tmpfs 912M 0 912M 0% /sys/fs/cgroup
/dev/sda1 xfs 1014M 179M 836M 18% /boot
/dev/mapper/centos-home xfs 47G 33M 47G 1% /home
tmpfs tmpfs 183M 44K 183M 1% /run/user/0
/dev/sr0 iso9660 4.3G 4.3G 0 100% /run/media/root/CentOS 7 x86_64
[root@linus ~]# df -t tmpfs -h #指定文件系统为tmpfs，并以合适的单位显示磁盘使用情况
文件系统 容量 已用 可用 已用% 挂载点
tmpfs 912M 0 912M 0% /dev/shm
tmpfs 912M 9.1M 903M 1% /run
tmpfs 912M 0 912M 0% /sys/fs/cgroup
tmpfs 183M 44K 183M 1% /run/user/0
