# Install classads with Homebrew, Nix Classified Advertisements (used by HTCondor Central Manager). Version 1.0.10 via Homebrew; verified from local package data. ## Install ```sh sudo av install brew:classads ``` Additional install commands: ### macOS - Homebrew (100%): ```sh brew install classads ``` Evidence: local Homebrew formula metadata ### Linux - Nix (92%): ```sh nix profile install nixpkgs#classads ``` Evidence: nixpkgs package indexes: pkgs/by-name/cl/classads/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 ## Package facts - **Package key:** brew:classads - **Package manager:** Homebrew - **Package manager page:** - **Version:** 1.0.10 - **Source summary:** Classified Advertisements (used by HTCondor Central Manager) - **Homepage:** - **Repository:** - **Upstream docs:** - **License:** Apache-2.0 - **Source archive:** - **Generated:** 2026-07-08T07:18:31+00:00 ## Executables - classad_functional_tester (cli) - classad_functional_tester_ns (cli) - classad_version (cli) - classad_version_ns (cli) - cxi (cli) - cxi_ns (cli) - classad_functional_tester (alias) - classad_functional_tester_ns (alias) - classad_version (alias) - classad_version_ns (alias) - cxi (alias) - cxi_ns (alias) ## Build dependencies - autoconf - automake - libtool ## Install behavior - Post-install hook: not defined - Bottle: available on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, sonoma, x86_64_linux ## Freshness - Page generated: 2026-07-08 - Package-manager version: 1.0.10 - Local data: ok - Upstream repository: https://research.cs.wisc.edu/htcondor/classad/ - info: No package-manager update timestamp was available. - info: Release/tag comparison is only available for GitHub repositories. ## Project history and usage ClassAds are HTCondor's classified advertisement language and matching mechanism for describing jobs, machines, submitters, resources, and constraints in high-throughput computing systems. ### Project history The official ClassAds page describes ClassAds as the lingua franca of HTCondor, exchanged by HTCondor processes to describe jobs, workstations, and other resources. The same page states that the ClassAd library is also available as a standalone package outside HTCondor. HTCondor documentation records a transition from Old ClassAds to New ClassAds: Old ClassAds were tied to HTCondor development libraries, New ClassAds added features and were designed as a standalone library, and HTCondor switched to the New ClassAd library in version 7.5.1. ### Adoption history The standalone C++ ClassAd distribution has official release history from 0.9.6 in October 2004 through 1.0.10 in April 2011. Homebrew packages that standalone tarball as classads 1.0.10 and reported 101 installs over the prior 365 days. ### How it is used ClassAds are used for matchmaking: a job ClassAd and a machine ClassAd can refer to one another while expressions evaluate whether constraints are satisfied. The Homebrew package exposes small C++ library utilities such as cxi and classad_version. ### Why package nerds care ClassAds is package-nerd interesting because Homebrew preserves a standalone slice of HTCondor's scheduler expression language as a small C++ package, separate from the much larger HTCondor system. ### Timeline - 2004: Official standalone C++ library version 0.9.6 released. - 2010: HTCondor 7.5.1 switched to the New ClassAd library. - 2011: Official standalone C++ library version 1.0.10 released. - 2026: Homebrew formula metadata lists classads 1.0.10 as stable. ### Related projects - ClassAds are part of the HTCondor software suite and are also documented in the HTCondor manual. - The official ClassAds page references Java implementations and ClassAd language papers/specifications alongside the C++ library. ### Sources - - - - - ## Security Notes narrow executable package without higher-risk signals. - **Geiger risk:** green / low - narrow executable package without higher-risk signals ## Source Database Details - **Source Database:** Homebrew formula API - **Tap:** homebrew/core - **Full Name:** classads - **Version Scheme:** 0 - **Revision:** 0 - **Bottle Stable Root URL:** - **Deprecated:** no - **Disabled:** no - **Keg Only:** no - **URL Keys:** stable ## Other Package-Manager Records - Nix - classads: normalized package name match | nixpkgs package indexes: pkgs/by-name/cl/classads/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 ## Related links - [Terminal utility packages](https://www.automicvault.com/pkg/terminal-utilities/) - Matched terminal and command-line workflow metadata. - [Networking and protocol packages](https://www.automicvault.com/pkg/networking-protocol-tools/) - Matched network, protocol, or remote-service metadata. - [Homebrew utility packages](https://www.automicvault.com/pkg/brew-utility-packages/) - Matched Homebrew package provider. - [Secret-risk packages](https://www.automicvault.com/pkg/secret-risk-packages/) - Matched curated package taxonomy and local package facts. - [autoconf](https://www.automicvault.com/pkg/brew/autoconf/) - Build dependency declared by Homebrew. - [automake](https://www.automicvault.com/pkg/brew/automake/) - Build dependency declared by Homebrew. - [libtool](https://www.automicvault.com/pkg/brew/libtool/) - Build dependency declared by Homebrew. - [snort](https://www.automicvault.com/pkg/brew/snort/) - Shares av.db curated category or tags: cli, scheduling, system. - [resticprofile](https://www.automicvault.com/pkg/brew/resticprofile/) - Shares av.db curated category or tags: cli, scheduler, system. - [abduco](https://www.automicvault.com/pkg/brew/abduco/) - Shares av.db curated category or tags: cli, system. - [acl](https://www.automicvault.com/pkg/brew/acl/) - Shares av.db curated category or tags: cli, system. - [acpica](https://www.automicvault.com/pkg/brew/acpica/) - Shares av.db curated category or tags: cli, system. - [afio](https://www.automicvault.com/pkg/brew/afio/) - Shares av.db curated category or tags: cli, system. - [afsctool](https://www.automicvault.com/pkg/brew/afsctool/) - Shares av.db curated category or tags: cli, system. - [afuse](https://www.automicvault.com/pkg/brew/afuse/) - Shares av.db curated category or tags: cli, system. - [btop](https://www.automicvault.com/pkg/brew/btop/) - Local package facts share a topical domain. Shared terms: cli, resource, system, version. ## Combined YAML source View the package source record on GitHub. [combined/classads.yml](https://github.com/automic-vault/db/blob/main/combined/classads.yml) ## Sources - Nucleus package database - Geiger risk classifier - package-page enrichment - curated package history - package version freshness - av.db category and tag curation - package relationship graph - external package-manager database matches - cross-ecosystem install command graph