# numdiff を Homebrew, apt, MacPorts, Nix でインストール

numdiff のインストール経路、実行ファイル、メタデータ、AI エージェント向けセキュリティノートを確認します。

## インストール

```sh
sudo av install brew:numdiff
```

追加のインストールコマンド:

### macOS

- Homebrew (100%):

```sh
brew install numdiff
```

  証拠: local Homebrew formula metadata

- MacPorts (94%):

```sh
sudo port install numdiff
```

  証拠: MacPorts ports tree: science/numdiff/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1

### Linux

- Debian apt (92%):

```sh
sudo apt install numdiff
```

  証拠: Debian stable package indexes: numdiff from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz

- Nix (92%):

```sh
nix profile install nixpkgs#numdiff
```

  証拠: nixpkgs package indexes: pkgs/by-name/nu/numdiff/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1

## パッケージ情報

- **パッケージキー:** brew:numdiff
- **パッケージマネージャ:** Homebrew
- **バージョン:** 5.9.0
- **ソース概要:** Putative files comparison tool
- **ホームページ:** <https://www.nongnu.org/numdiff>
- **生成日時:** 2026-08-03T19:37:03+00:00

## 実行可能ファイル

- ndselect (エイリアス)
- numdiff (エイリアス)

## インストール挙動

- Bottle: 利用不可

## バージョンと鮮度

- ページ生成日: 2026-08-03
- マネージャ版: 5.9.0
## プロジェクトの歴史と使われ方

Numdiff is a small, long-lived NonGNU utility by Ivano Primi for comparing files that contain numeric fields. Its reason to exist is simple: ordinary `diff`, `cmp`, and `wdiff` do not know that two textual representations may be numerically equivalent, nor can they ignore numeric changes below a requested tolerance.

### プロジェクトの歴史

The official manual for Numdiff 5.9 carries copyrights from 2005 through 2017 and documents a mature Unix-style C program built with the usual `configure`, `make`, and `make install` workflow. The 5.9 manual also notes that older 5.x releases accepted fewer options and that 4.0.0 and 3.x used a different output format, so the package has a real pre-5.x history even though public narrative sources are sparse.

### 採用の歴史

Numdiff has modest adoption: it is packaged by Homebrew, Debian/Ubuntu, MacPorts, Nix, and GNU Guix, but it is not a broad ecosystem cornerstone. Homebrew's formula page listed only 43 installs over 365 days on July 1, 2026, which fits the profile of a specialist testing/scientific utility that users reach for when normal diffs are too literal.

### 使われ方

The practical workflow is comparing generated numeric output line by line and field by field while setting absolute or relative tolerances and accepting equivalent numeric notation. Numdiff also ships `ndselect` for selecting lines and fields, and version 5.9 added a raw output format intended for machine parsing.

### パッケージ好きにとっての重要性

Numdiff is the classic package-manager long tail: tiny, stable, GPL-licensed, and exactly useful when validating numerical programs whose outputs vary by rounding, notation, platform, compiler, or BLAS implementation. It is most likely to appear in regression-test scripts, scientific-code QA, and packaging test fixtures.

### タイムライン

- 2005-2017: Years covered by the official manual copyright range.
- 5.9: Adds compact raw output intended for parsing by other programs.

### Related projects

- GNU diffutils
- wdiff
- cmp

### ソース

- <https://formulae.brew.sh/formula/numdiff>
- <https://packages.guix.gnu.org/packages/numdiff/5.9.0/>
- <https://www.nongnu.org/numdiff/>
- <https://www.nongnu.org/numdiff/numdiff.html>


## セキュリティノート

narrow executable package without higher-risk signals.

- **Geiger リスク:** グリーン / 低
- narrow executable package without higher-risk signals

## 他のパッケージマネージャ記録

- Debian apt - numdiff - 5.9.0-2: normalized package name match | Debian stable package indexes: numdiff from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Compare similar files with numeric fields | https://nongnu.org/numdiff/
- Nix - numdiff: normalized package name match | nixpkgs package indexes: pkgs/by-name/nu/numdiff/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
- Ubuntu apt - numdiff - 5.9.0-1: normalized package name match | Ubuntu 24.04 LTS package indexes: numdiff from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Compare similar files with numeric fields | http://nongnu.org/numdiff/
- MacPorts - numdiff: normalized package name match | MacPorts ports tree: science/numdiff/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1


## Combined YAML source

View the package source record on GitHub. [combined/numdiff.yml](https://github.com/mxcl/pkgdb/blob/main/combined/numdiff.yml)


## ソース

- pkg.so package database
- Geiger risk classifier
- curated package history
- pkgdb category and tag curation
- external package-manager database matches
- cross-ecosystem install command graph