---
title: duf — modern df
date: 2026-10-18
time: 12:00
model: admin
category: programs
author_type: human
summary: A df replacement tool that beautifully displays disk free space in a table.
tags: program, Modern CLI Tools, duf
---

**💬 "duf command"**

duf is a replacement for **the modern df** that shows disk free space in a pretty table.

It displays usage and free space of mounted file systems. It outputs in a clean table without df's inconvenient line breaks.

- **Concept**: Displays usage and free space of mounted file systems.
- **Main Features**: Outputs in a clean table without df's inconvenient line breaks.
- **Advantages**: Columns align neatly.
- **Use Case**: Can view specific file systems only.
## Installation and Download

duf can be installed via a package manager or the official script.

| Environment | Command |
| --- | --- |
| Ubuntu / Debian | sudo apt install duf |
| Fedora / RHEL | sudo dnf install duf |
| Arch | sudo pacman -S duf |
| macOS (brew) | brew install duf |
| Go install | go install github.com/muesli/duf@latest |
| Binary Download | github.com/muesli/duf/releases |

Verify the installation with `duf --version`.

## Frequently Used Options

| Option | Description |
| --- | --- |
| --all | Displays all file systems. |
| --json | Outputs in JSON format. |
| --sort size | Sorts by size. |
| --filter | Filters specific mounts only. |
| -x tmpfs | Excludes tmpfs. |

## Essential Command Combinations

- `duf --all` — Check all mount statuses.
- `duf --sort size` — View sorted by size.
- `duf --json | jq` — Output as JSON for use in scripts.
**💬 "Show me an example of using duf on an actual server"**

Here is a step-by-step guide for situations commonly encountered on production servers.

### Step 1 · Verify Installation

Check if it is installed.

```
duf --version || sudo apt install -y duf
```

### Step 2 · Full Overview

Check all mount statuses.

```
duf --all
```

### Step 3 · Check Sorting

View sorted by size.

```
duf --sort size
```

## Actual Execution Output

Here is the result of checking the server's mount status with duf. The table aligns cleanly.

![duf command execution result](https://games.aidebatehub.com/assets/duf-demo.png)

Production server

## How It Is Used in Practice

### 1. Monitoring Script

**Situation** — Used in scripts that check disk space.

```
duf --json | jq -r '.[] | select(.size_bytes > 1000000000) | .mountpoint'
```

**Result** — A list of large mount points is displayed.

**Key Point** — JSON output is convenient for script processing.

### 2. Specific Mounts Only

**Situation** — Check only NFS mounts.

```
duf nfs
```

**Result** — Only NFS mount information is displayed.

**Key Point** — You can filter to view only the targets you need.

## Actual Execution Output

This is the result sorted by size.

![duf command execution result 2](https://games.aidebatehub.com/assets/duf-demo2.png)

Production server

## Points of Caution

- Without root permissions, duf may not be able to see some mounts.
- Inside containers, host mounts may not be visible correctly.
- Since it shows the same information as df, it can be a direct replacement in existing monitoring scripts.
- The --json output is useful when combined with jq in scripts.

---
Source (HTML): https://games.aidebatehub.com/programs/linux/modern/duf.html
This file is an auto-generated Markdown twin of the DevHub document.