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[#]: subject: "Check free disk space in Linux with ncdu"
[#]: via: "https://opensource.com/article/21/8/ncdu-check-free-disk-space-linux"
[#]: author: "Seth Kenlon https://opensource.com/users/seth"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
Check free disk space in Linux with ncdu
======
Get an interactive report about disk usage with the ncdu Linux command.
![Check disk usage][1]
Computer users tend to amass a lot of data over the years, whether it's important personal projects, digital photos, videos, music, or code repositories. While hard drives tend to be pretty big these days, sometimes you have to step back and take stock of what you're actually storing on your drives. The classic Linux commands [` df`][2] and [` du`][3] are quick ways to gain insight about what's on your drive, and they provide a reliable report that's easy to parse and process. That's great for scripting and processing, but the human brain doesn't always respond well to hundreds of lines of raw data. In recognition of this, the `ncdu` command aims to provide an interactive report about the space you're using on your hard drive.
### Installing ncdu on Linux
On Linux, you can install `ncdu` from your software repository. For instance, on Fedora or CentOS:
```
`$ sudo dnf install ncdu`
```
On BSD, you can use [pkgsrc][4].
On macOS, you can install from [MacPorts][5] or [HomeBrew][6].
Alternately, you can [compile ncdu from source code][7].
### Using ncdu
The interface of `ncdu` uses the ncurses library, which turns your terminal window into a rudimentary graphical application so you can use the Arrow keys to navigate visual menus.
![ncdu interface][8]
CC BY-SA Seth Kenlon
That's one of the main appeals of `ncdu`, and what sets it apart from the original `du` command.
To get a complete listing of a directory, launch `ncdu`. It defaults to the current directory.
```
$ ncdu
ncdu 1.16 ~ Use the arrow keys to navigate, press ? for help                                                                  
\--- /home/tux -----------------------------------------------
   22.1 GiB [##################] /.var                                                                                        
   19.0 GiB [###############   ] /Iso
   10.0 GiB [########          ] /.local
    7.9 GiB [######            ] /.cache
    3.8 GiB [###               ] /Downloads
    3.6 GiB [##                ] /.mail
    2.9 GiB [##                ] /Code
    2.8 GiB [##                ] /Documents
    2.3 GiB [#                 ] /Videos
[...]
```
The listing shows the largest directory first (in this example, that's the `~/.var` directory, full of many many flatpaks).
Using the Arrow keys on your keyboard, you can navigate through the listing to move deeper into a directory so you can gain better insight into what's taking up the most space.
### Get the size of a specific directory
You can run `ncdu` on an arbitrary directory by providing the path of a folder when launching it:
```
`$ ncdu ~/chromiumos`
```
### Excluding directories
By default, `ncdu` includes everything it can, including symbolic links and pseudo-filesystems such as procfs and sysfs. `You can` exclude these with the `--exclude-kernfs`.
You can exclude arbitrary files and directories using the --exclude option, followed by a pattern to match.
```
$ ncdu --exclude ".var"
   19.0 GiB [##################] /Iso                                                                                          
   10.0 GiB [#########         ] /.local
    7.9 GiB [#######           ] /.cache
    3.8 GiB [###               ] /Downloads
[...]
```
Alternately, you can list files and directories to exclude in a file, and cite the file using the `--exclude-from` option:
```
$ ncdu --exclude-from myexcludes.txt /home/tux                                                                                    
   10.0 GiB [#########         ] /.local
    7.9 GiB [#######           ] /.cache
    3.8 GiB [###               ] /Downloads
[...]
```
### Color scheme
You can add some color to ncdu with the `--color dark` option.
![ncdu color scheme][9]
CC BY-SA Seth Kenlon
### Including symlinks
The `ncdu` output treats symlinks literally, meaning that a symlink pointing to a 9 GB file takes up just 40 bytes.
```
$ ncdu ~/Iso
    9.3 GiB [##################]  CentOS-Stream-8-x86_64-20210427-dvd1.iso                                                    
@   0.0   B [                  ]  fake.iso
```
You can force ncdu to follow symlinks with the `--follow-symlinks` option:
```
$ ncdu --follow-symlinks ~/Iso
    9.3 GiB [##################]  fake.iso                                                                                    
    9.3 GiB [##################]  CentOS-Stream-8-x86_64-20210427-dvd1.iso
```
### Disk usage
It's not fun to run out of disk space, so monitoring your disk usage is important. The `ncdu` command makes it easy and interactive. Try `ncdu` the next time you're curious about what you've got stored on your PC, or just to explore your filesystem in a new way.
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/8/ncdu-check-free-disk-space-linux
作者：[Seth Kenlon][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/seth
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/du-splash.png?itok=nRLlI-5A (Check disk usage)
[2]: https://opensource.com/article/21/7/check-disk-space-linux-df
[3]: https://opensource.com/article/21/7/check-disk-space-linux-du
[4]: https://opensource.com/article/19/11/pkgsrc-netbsd-linux
[5]: https://opensource.com/article/20/11/macports
[6]: https://opensource.com/article/20/6/homebrew-mac
[7]: https://dev.yorhel.nl/ncdu
[8]: https://opensource.com/sites/default/files/ncdu.jpg (ncdu interface)
[9]: https://opensource.com/sites/default/files/ncdu-dark.jpg (ncdu color scheme)

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[#]: subject: "Check free disk space in Linux with ncdu"
[#]: via: "https://opensource.com/article/21/8/ncdu-check-free-disk-space-linux"
[#]: author: "Seth Kenlon https://opensource.com/users/seth"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
用 ncdu 检查 Linux 中的可用磁盘空间
======
用 ncdu Linux 命令获得关于磁盘使用的交互式报告。
![Check disk usage][1]
计算机用户多年来往往积累了大量的数据，无论是重要的个人项目、数码照片、视频、音乐还是代码库。虽然现在的硬盘往往相当大，但有时你必须退一步，评估一下你在硬盘上实际存储了什么。经典的 Linux 命令 [`df`][2] 和 [`du`][3] 是快速了解硬盘上的内容的方法，它们提供了一个可靠的报告，易于解析和处理。这对脚本和处理来说是很好的，但人的大脑对数百行的原始数据并不总是反应良好。认识到这一点，`ncdu` 命令旨在提供一份关于你在硬盘上使用的空间的交互式报告。
### 在 Linux 上安装 ncdu
在 Linux 上，你可以从你的软件仓库安装 `ncdu`。例如，在 Fedora 或 CentOS 上：
```
`$ sudo dnf install ncdu`
```
在 BSD 上，你可以使用 [pkgsrc][4]。
在 macOS 上，你可以从 [MacPorts][5] 或 [HomeBrew][6] 安装。
另外，你也可以[从源码编译 ncdu][7]。
### 使用 ncdu
ncdu 界面使用 ncurses 库，它将你的终端窗口变成一个基本的图形应用，所以你可以使用方向键来浏览菜单。
![ncdu interface][8]
CC BY-SA Seth Kenlon
这是 `ncdu` 的主要吸引力之一，也是它与最初的 `du` 命令不同的地方。
要获得一个目录的完整列表，启动 `ncdu`。它默认为当前目录。
```
$ ncdu
ncdu 1.16 ~ Use the arrow keys to navigate, press ? for help
\--- /home/tux -----------------------------------------------
22.1 GiB [##################] /.var
19.0 GiB [############### ] /Iso
10.0 GiB [######## ] /.local
7.9 GiB [###### ] /.cache
3.8 GiB [### ] /Downloads
3.6 GiB [## ] /.mail
2.9 GiB [## ] /Code
2.8 GiB [## ] /Documents
2.3 GiB [# ] /Videos
[...]
```
这个列表首先显示了最大的目录（在这个例子中，那是 `~/.var` 目录，充满了很多的 flatpaks）。
使用键盘上的方向键，你可以浏览列表，深入到一个目录，这样你就可以更好地了解什么东西占用了最大的空间。
### 获取一个特定目录的大小
你可以在启动 `ncdu` 时提供任意一个文件夹的路径：
```
`$ ncdu ~/chromiumos`
```
### 排除目录
默认情况下，`ncdu` 包括一切可以包括的东西，包括符号链接和伪文件系统，如 procfs 和 sysfs。你可以用 `--exclude-kernfs` 来排除这些。
你可以使用 --exclude 选项排除任意文件和目录，并在后面加上一个匹配模式。
```
$ ncdu --exclude ".var"
19.0 GiB [##################] /Iso
10.0 GiB [######### ] /.local
7.9 GiB [####### ] /.cache
3.8 GiB [### ] /Downloads
[...]
```
另外，你可以在文件中列出要排除的文件和目录，并使用 `--exclude-from` 选项来引用该文件：
```
$ ncdu --exclude-from myexcludes.txt /home/tux
10.0 GiB [######### ] /.local
7.9 GiB [####### ] /.cache
3.8 GiB [### ] /Downloads
[...]
```
### 颜色方案
你可以用 `--color dark` 选项给 ncdu 添加一些颜色。
![ncdu color scheme][9]
CC BY-SA Seth Kenlon
### 包括符号链接
`ncdu` 输出按字面意思处理符号链接，这意味着一个指向 9GB 文件的符号链接只占用 40 个字节。
```
$ ncdu ~/Iso
9.3 GiB [##################] CentOS-Stream-8-x86_64-20210427-dvd1.iso
@ 0.0 B [ ] fake.iso
```
你可以用 `--follow-symlinks` 选项强制 ncdu 跟踪符号链接：
```
$ ncdu --follow-symlinks ~/Iso
9.3 GiB [##################] fake.iso
9.3 GiB [##################] CentOS-Stream-8-x86_64-20210427-dvd1.iso
```
### 磁盘使用率
磁盘空间用完并不有趣，所以监控你的磁盘使用情况很重要。`ncdu` 命令使它变得简单和互动。下次当你对你的电脑上存储的东西感到好奇时，或者只是想以一种新的方式探索你的文件系统时，不妨试试 `ncdu`。
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/8/ncdu-check-free-disk-space-linux
作者：[Seth Kenlon][a]
选题：[lujun9972][b]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/seth
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/du-splash.png?itok=nRLlI-5A (Check disk usage)
[2]: https://opensource.com/article/21/7/check-disk-space-linux-df
[3]: https://opensource.com/article/21/7/check-disk-space-linux-du
[4]: https://opensource.com/article/19/11/pkgsrc-netbsd-linux
[5]: https://opensource.com/article/20/11/macports
[6]: https://opensource.com/article/20/6/homebrew-mac
[7]: https://dev.yorhel.nl/ncdu
[8]: https://opensource.com/sites/default/files/ncdu.jpg (ncdu interface)
[9]: https://opensource.com/sites/default/files/ncdu-dark.jpg (ncdu color scheme)