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本文主要介绍在Linux操作系统中，使用 df 和 du 命令获取系统空间使用情况的方法。
1 df命令
1.1 概述
df 命令的作用：report file system disk space usage.
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.
1.2 常见用法
1.2.1 查看当前已挂载的文件系统的空间使用情况
[root@accapp ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 50G 20K 100% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 392M 3.5G 10% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/mapper/centos-usr 16G 11G 5.4G 67% /usr
/dev/sda1 197M 110M 88M 56% /boot
/dev/mapper/centos-tmp 50G 36M 50G 1% /tmp
/dev/mapper/centos-data 368G 31G 337G 9% /data
tmpfs 783M 0 783M 0% /run/user/0
[root@accapp ~]#
2 du
2.1 概述
du命令的作用：estimate file space usage.
Summarize disk usage of each FILE, recursively for directories.
2.2 常见用法
2.2.1 查看当前目录下所有子目录的占用空间大小
-s（--summarize）选项的作用：display only a total for each argument.
[root@accapp /]# du -sh *
0 bin
99M boot
31G data
0 dev
4.0K devnull
0 docker-hub
35M etc
39G home
0 lib
0 lib64
0 media
0 mnt
379M opt
du: cannot access ‘proc/11858/task/11858/fd/4’: No such file or directory
du: cannot access ‘proc/11858/task/11858/fdinfo/4’: No such file or directory
du: cannot access ‘proc/11858/fd/4’: No such file or directory
du: cannot access ‘proc/11858/fdinfo/4’: No such file or directory
0 proc
3.9G root
392M run
0 sbin
0 srv
0 sys
68K tmp
4.0K tmp_sha1
11G usr
7.6G var
[root@accapp /]#