使用命令：
df -hl
可以查看磁盘空间使用状况。
NAME
df - report file system disk space usage
SYNOPSIS
df [OPTION]... [FILE]...
DESCRIPTION
This manual page documents the GNU version of df. 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.
If an argument is the absolute file name of a disk device node contain‐
ing a mounted file system, df shows the space available on that file
system rather than on the file system containing the device node. This
version of df cannot show the space available on unmounted file sys‐
tems, because on most kinds of systems doing so requires very non‐
portable intimate knowledge of file system structures.
