# 使用 Homebrew, MacPorts, Nix 安装 base91

查看 base91 的安装路径、可执行文件、元数据以及面向 AI 代理工作流的安全说明。

## 安装

```sh
sudo av install brew:base91
```

其他安装命令:

### macOS

- Homebrew (100%):

```sh
brew install base91
```

  证据: local Homebrew formula metadata

- MacPorts (94%):

```sh
sudo port install base91
```

  证据: MacPorts ports tree: mail/base91/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1

### Linux

- Nix (92%):

```sh
nix profile install nixpkgs#base91
```

  证据: nixpkgs package indexes: pkgs/by-name/ba/base91/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1

## 软件包事实

- **软件包键:** brew:base91
- **软件包管理器:** Homebrew
- **版本:** 0.6.0
- **来源摘要:** Utility to encode and decode base91 files
- **主页:** <https://base91.sourceforge.net/>
- **已生成:** 2026-08-03T19:37:03+00:00

## 可执行文件

- b91dec (别名)
- b91enc (别名)
- base91 (别名)

## 安装行为

- Bottle: 不可用

## 版本和新鲜度

- 页面生成时间: 2026-08-03
- 管理器版本: 0.6.0
## 项目历史与用法

basE91 is a binary-to-text encoding method and command-line tool that encodes binary data as ASCII characters with less overhead than Base64 for many inputs.

### 项目历史

The SourceForge project page describes basE91 as an advanced method for encoding binary data as ASCII characters, similar to uuencode or Base64 but more efficient. It reports overhead of at most 23 percent and as low as 14 percent depending on input.

The SourceForge files page identifies the latest 0.6.0 Java archive release in November 2006, and the project page shows project activity dating to October 2006. The project's official website remains base91.sourceforge.net.

### 采用历史

basE91 remains niche, but the input package metadata lists Homebrew, MacPorts, and Nix packaging, and the SourceForge project records tens of thousands of file downloads over its lifetime. Its adoption is mostly among developers who specifically need denser ASCII armoring than Base64 rather than users of general-purpose OS tooling.

The project page classifies it under data formats, terminals, email, algorithms, and internet topics, reflecting the encoding's intended transport and storage use cases.

### 使用方式

The packaged CLI exposes base91 plus b91enc and b91dec executables according to the Homebrew input metadata. It is used as an encoder/decoder filter for files or streams where ASCII-safe text output is required.

There is no documented configuration file or credentials store; the tool is a stateless encoder/decoder.

### 为什么软件包爱好者会关心

basE91 is significant as one of the better-known post-Base64 ASCII-armoring experiments. It trades simplicity and universal support for denser output, which makes it a useful reference point in discussions of binary-to-text encoding efficiency.

Its package-manager presence is also a classic long-tail case: a 2006 SourceForge utility still appears in modern package indexes because encoding tools age slowly when their formats are stable.

### 时间线

- 2006: SourceForge project activity and project metadata date basE91 to October 2006.
- 2006: Latest SourceForge release path records version 0.6.0 in November 2006.
- 2020s: Input package metadata shows basE91 available through Homebrew, MacPorts, and Nix.

### Related projects

- Base64 and uuencode are the official comparison points named by the SourceForge description.
- Other ASCII-armoring and binary-to-text encodings, including Ascii85/Base85, are conceptually adjacent even though they are separate formats.
- SourceForge hosts the original project site and release files for basE91.

### 来源

- <https://base91.sourceforge.net/>
- <https://sourceforge.net/projects/base91>
- <https://sourceforge.net/projects/base91/files/>
- source_facts.package-manager


## 安全说明

narrow executable package without higher-risk signals.

- **Geiger 风险:** 绿色 / 低
- narrow executable package without higher-risk signals

## 其他软件包管理器记录

- Nix - base91: normalized package name match | nixpkgs package indexes: pkgs/by-name/ba/base91/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1
- MacPorts - base91: normalized package name match | MacPorts ports tree: mail/base91/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/base91.yml](https://github.com/mxcl/pkgdb/blob/main/combined/base91.yml)


## 来源

- 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