Linux操作系统中df和du命令常见用法

快来打我* 2022-03-20 08:58 328阅读 0赞

本文主要介绍 Linux操作系统的 df 和 du 命令的常见用法。

# 1 df命令 #

## 1.1 概述 ##

引用 Manual 手册中对于 df 命令的介绍，内容如下：

> 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.
> 
> Show information about the file system on which each FILE resides, or all file systems by default.

## 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命令 #

## 2.1 概述 ##

引用 Manual 手册中对于 df 命令的介绍，内容如下：

> 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文件夹的空间占用情况 ###

**-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 /]#