df - report file system disk space usage - 文件系统磁盘空间使用情况

df - report file system disk space usage - 文件系统磁盘空间使用情况

df displays the amount of disk space available on the file system containing each file name argument. If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
df 显示包含每个文件名参数的文件系统上可用的磁盘空间量。如果未提供文件名，则会显示所有当前已挂载文件系统上的可用空间。默认情况下，磁盘空间以 1K 块显示，除非设置了环境变量 POSIXLY_CORRECT，在这种情况下使用 512 字节块。

If an argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file system rather than on the file system containing the device node.
如果参数是包含已挂载文件系统的磁盘设备节点的绝对文件名，则 df 显示该文件系统上而不是包含设备节点的文件系统上的可用空间。

Show information about the file system on which each FILE resides, or all file systems by default.
显示有关每个 FILE 所在的文件系统或默认情况下所有文件系统的信息。

Mandatory arguments to long options are mandatory for short options too.
长选项的强制性参数对于短选项也是必需的。

(base) yongqiang@yongqiang:~$ df
Filesystem     1K-blocks     Used Available Use% Mounted on
rootfs         109846524 72211996  37634528  66% /
none           109846524 72211996  37634528  66% /dev
none           109846524 72211996  37634528  66% /run
none           109846524 72211996  37634528  66% /run/lock
none           109846524 72211996  37634528  66% /run/shm
none           109846524 72211996  37634528  66% /run/user
C:             109846524 72211996  37634528  66% /mnt/c
D:             262143996  5712844 256431152   3% /mnt/d
E:             335544316 21217500 314326816   7% /mnt/e
F:             167772156 16833548 150938608  11% /mnt/f
(base) yongqiang@yongqiang:~$

-a, --all
include pseudo, duplicate, inaccessible file systems

(base) yongqiang@yongqiang:~$ df -a
Filesystem     1K-blocks     Used Available Use% Mounted on
rootfs         109846524 76268644  33577880  70% /
none           109846524 76268644  33577880  70% /dev
sysfs                  0        0         0    - /sys
proc                   0        0         0    - /proc
devpts                 0        0         0    - /dev/pts
none           109846524 76268644  33577880  70% /run
none           109846524 76268644  33577880  70% /run/lock
none           109846524 76268644  33577880  70% /run/shm
none           109846524 76268644  33577880  70% /run/user
binfmt_misc            0        0         0    - /proc/sys/fs/binfmt_misc
C:             109846524 76268644  33577880  70% /mnt/c
D:             262143996  5712844 256431152   3% /mnt/d
E:             335544316 21217500 314326816   7% /mnt/e
F:             167772156 16833548 150938608  11% /mnt/f
(base) yongqiang@yongqiang:~$

pseudo /ˈsuːdəʊ; ˈsjuːdəʊ/：n. 伪君子，假冒的人 adj. 冒充的，假的

-h, --human-readable
print sizes in powers of 1024 (e.g., 1023M)
1024 单位

(base) yongqiang@yongqiang:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs          105G   70G   36G  67% /
none            105G   70G   36G  67% /dev
none            105G   70G   36G  67% /run
none            105G   70G   36G  67% /run/lock
none            105G   70G   36G  67% /run/shm
none            105G   70G   36G  67% /run/user
C:              105G   70G   36G  67% /mnt/c
D:              250G  5.5G  245G   3% /mnt/d
E:              320G   21G  300G   7% /mnt/e
F:              160G   17G  144G  11% /mnt/f
(base) yongqiang@yongqiang:~$

-H, --si
print sizes in powers of 1000 (e.g., 1.1G)
1000 单位

(base) yongqiang@yongqiang:~$ df -H
Filesystem      Size  Used Avail Use% Mounted on
rootfs          113G   75G   38G  67% /
none            113G   75G   38G  67% /dev
none            113G   75G   38G  67% /run
none            113G   75G   38G  67% /run/lock
none            113G   75G   38G  67% /run/shm
none            113G   75G   38G  67% /run/user
C:              113G   75G   38G  67% /mnt/c
D:              269G  5.9G  263G   3% /mnt/d
E:              344G   22G  322G   7% /mnt/e
F:              172G   18G  155G  11% /mnt/f
(base) yongqiang@yongqiang:~$