Facter vs htop

Facter is a free command-line tool that gathers system information such as hardware details, network settings, and operating system type and version. Puppet uses it to collect information before requesting a catalog or compiling one with puppet apply. Its built-in core facts include legacy and structured facts, though some facts do not apply to every system. Users can add custom facts in Ruby, with multiple resolutions available for determining a value, or external facts that return static data or output from a script or program. Facts can be hashes or arrays, and Boolean, numeric, and structured values retain their types. Configuration can block fact groups or cache results with time-to-live settings. Facts are available in Puppet manifests, while the --puppet option loads Puppet-specific facts from the command line. PuppetDB's API can support exploration, search, and reporting on infrastructure facts. Facter runs on Linux, macOS, and Windows and can be self-hosted. Legacy facts are omitted from default command-line output unless --show-legacy is used. Puppet's custom-fact examples require some Ruby familiarity, and facter.conf must be created manually or managed with a module.

htop is a free, text-mode interactive process viewer for Linux and macOS. It runs in console or X terminals and requires ncurses, offering a command-line interface for watching and managing running processes. Current releases also list FreeBSD, NetBSD, OpenBSD, DragonFly BSD, and Solaris as supported systems. The project, founded in 2004, is distributed as source code on GitHub and as pre-compiled packages from operating-system distributors, with installation examples for Debian, Fedora, Gentoo, and Arch Linux; Homebrew includes it for macOS. Its display can show Unicode Braille graphs and a Unicode tree view, including visual support for large processor counts. Users can set I/O scheduling priority and CPU affinity, choose dark or light terminal themes, and customize header meters. The memory percentage covers process-used memory; htop does not provide a per-process SWAP column.