install

Additional install commands

macOS

Homebrewverified · 100%

brew install spigot

local Homebrew formula metadata

Linux

Debian aptverified · 92%

sudo apt install spigot

Debian stable package indexes · spigot · source: deb.debian.org

Nixverified · 92%

nix profile install nixpkgs#spigot

nixpkgs package indexes · pkgs/by-name/sp/spigot/package.nix · source: api.github.com

overview

Package summary

Command-line streaming exact real calculator

Project links

Commands and aliases

spigot

history

Project history and usage

spigot is Simon Tatham's command-line exact real calculator, aimed at producing verified digits from mathematical expressions rather than fast floating-point approximations.

Project history

The official page describes spigot as a streaming exact real calculator named after Jeremy Gibbons's unbounded spigot algorithm for digits of pi, expanded to support more output modes and input numbers.

Adoption history

The project is distributed from the author's site as a Unix source archive and Windows executable, with official development sources in a Tartarus git repository. The input package facts show it packaged in Homebrew, Debian, Nix, and Ubuntu.

How it is used

The manual documents an expression language, output modes, rounding modes, file and pipe input, and a Unix man-page appendix. Its niche is slow but exact calculation, especially for many digits, numerically fragile expressions, or cross-checking another system.

Why package nerds care

For package people, spigot is the pleasing sort of small CLI that rewards being packaged: mathematically specialized, scriptable, source-distributed, and useful as a reproducibility check when ordinary calculators hide rounding behavior.

Timeline

2026: Official page offered source archive spigot-20260410.ed81b83.tar.gz and was last modified on April 10.
2026: Official page documented the Tartarus git repository as the latest development source.

Related projects

Jeremy Gibbons's unbounded spigot algorithm
Unix calculators
exact real arithmetic tools

Sources

https://www.chiark.greenend.org.uk/~sgtatham/spigot/
https://www.chiark.greenend.org.uk/~sgtatham/spigot/spigot.html
input source_facts.package-manager

security posture

Risk level: blue

broad file, network, media, or database tool signal.

Risk classifier

blue risk · medium confidence · tool

Why

broad file, network, media, or database tool signal

Signals

text:stream

Install behavior

No Homebrew post-install hook is recorded in formula metadata.
Homebrew bottle metadata is available for 6 platform targets.
Build metadata lists 1 build dependencies.

Recommended review

Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.

executables

Installed executables

Command	Kind	Exposure	Note
`spigot`	cli	global executable

freshness

Version and freshness

These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.

page generated2026-07-08

manager version20260410

manager updated2026-04-11

local dataok

upstreamnot checked

latest detectednot detected

https://www.chiark.greenend.org.uk/~sgtatham/spigot/

infoRelease/tag comparison is only available for GitHub repositories.https://www.chiark.greenend.org.uk/~sgtatham/spigot/none confidence

install metadata

Package metadata

Package key	brew:spigot
Version	20260410
Package manager	Homebrew
Package manager page	https://formulae.brew.sh/formula/spigot
Homepage	https://www.chiark.greenend.org.uk/~sgtatham/spigot/
Repository	https://git.tartarus.org/?p=simon%2Fspigot.git
Upstream docs	https://www.chiark.greenend.org.uk/~sgtatham/spigot
License	MIT
Source archive	https://www.chiark.greenend.org.uk/~sgtatham/spigot/spigot-20260410.ed81b83.tar.gz
Last updated	2026-04-11T00:53:41Z
Pulse	updated
Build dependencies	cmake
Uses from macOS	ncurses
Bottle	available (on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux)
Homebrew post-install	not defined
Service	none declared

registry facts

Source database details

Source Database	Homebrew formula API
Tap	homebrew/core
Full Name	spigot
Version Scheme	0
Revision	0
Bottle Stable Root URL	https://ghcr.io/v2/homebrew/core
Deprecated	no
Disabled	no
Keg Only	no
URL Keys	stable

source database matches

Other package-manager records

Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.

Debian apt95%

spigot 0.2017-01-15.gdad1bbc6-1+b1

Exact real calculator

http://www.chiark.greenend.org.uk/~sgtatham/spigot/

sudo apt install spigot

Section: math
Architecture: amd64
Source Package: spigot
5 dependencies
normalized package name match
Matched by: Spigot

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

Nix95%

spigot

nix profile install nixpkgs#spigot

normalized package name match
Matched by: Spigot

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

Ubuntu apt95%

spigot 0.2017-01-15.gdad1bbc6-1build2

Exact real calculator

http://www.chiark.greenend.org.uk/~sgtatham/spigot/

sudo apt install spigot

Section: universe/math
Architecture: amd64
5 dependencies
normalized package name match
Matched by: Spigot

Ubuntu 24.04 LTS package indexes · archive.ubuntu.com · Ubuntu 24.04 LTS package indexes: spigot from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz

package graph

Links come from deterministic package relationships, av.db category and tag curation, ecosystem matches, and package hub membership.

source trail

Generated from repository data

This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.

Combined YAML source

View the package source record on GitHub.

combined/spigot.yml

Used sources

Geiger risk classifier
Nucleus package database
av.db category and tag curation
cross-ecosystem install command graph
curated package history
external package-manager database matches
package relationship graph
package version freshness
package-page enrichment

Install spigot with Homebrew, apt, Nix