Causal tracing across resource types
Trace a running process, port, container, or file back through the chain of systems that started it, rather than only showing current state.
witr
witr is a CLI and TUI tool that traces a process, port, container, or file back to what started it. It helps developers and operators understand why something is running and can also emit machine-readable JSON for automation.
Overview
witr is a developer tool for answering a specific operational question: why is this running? It traces a process, port, container, or file back to the chain of events and systems that started it, instead of forcing you to reconstruct that story by hand from multiple system tools.
The project is built for both direct terminal use and interactive investigation. According to the README, witr can present results as a human-readable command output, machine-readable JSON, or an interactive TUI dashboard, which makes it useful for one-off debugging as well as scripted workflows.
Core capabilities
Explain startup provenance
Surface where something came from, how it was started, and what is responsible for it existing now in a single view.
CLI-first workflow
Use the command-line interface for straightforward, scriptable checks when you want direct output rather than a screen-based workflow.
Interactive TUI
Switch to an interactive TUI dashboard for investigating a running system visually when you need more context.
JSON output mode
Request machine-readable JSON output for automation or downstream processing.
Multiple installation paths
Install through release binaries, package managers, or source builds across supported operating systems.
Practical use cases
Find the origin of a suspicious process
Investigate a process that appeared unexpectedly and follow it back to the shell, supervisor, or service that launched it.
Trace port ownership back to its cause
Determine what started a service or container that is holding a port so you can understand the dependency chain before making changes.
Automate environment checks
Run witr from scripts or automation and consume JSON output when you need a machine-readable explanation of runtime state.
Interactive troubleshooting in the terminal
Use the interactive TUI to inspect a system more visually when you are debugging live on a terminal and want a clearer overview.
Pros and Cons
Pros
- Explains causal chains instead of only listing what is currently running.
- Supports several resource types, including processes, ports, containers, and files.
- Offers both CLI output and an interactive TUI for different investigation styles.
- Includes machine-readable JSON output for automation.
- Has broad platform coverage through static binaries and multiple package managers.
Cons
- The README is strong on purpose and installation, but provides less detail in the excerpts about exact command syntax and supported flags.
- Some ecosystem packages may lag behind GitHub releases because they are independently maintained.
FAQ
What does witr do?
witr is a CLI and TUI tool for tracing a running process, port, container, or file back to the chain that started it. The README frames it as a way to answer “Why is this running?” from one place instead of correlating several system tools manually.
What output modes does witr support?
The README describes witr as producing one command’s worth of output, machine-readable JSON, or an interactive TUI dashboard. That gives users a choice between scripted use and an interactive investigation flow.
Which platforms and install methods are supported?
The documentation says witr is distributed as a single static binary for Linux, macOS, FreeBSD, and Windows. It also lists package-manager installs for several ecosystems, including apt, Homebrew, MacPorts, Conda, Arch AUR, winget, npm, FreeBSD ports, Chocolatey, Scoop, AOSC OS, GNU Guix, Uniget, Aqua, Brioche, and Mise.
When is witr useful?
The README positions witr for situations where the cause of a running thing is indirect or spread across layers such as supervisors, containers, services, or shells. It can help when tools like ps, lsof, ss, systemctl, or docker ps show state but not the causal chain.
Is witr a paid product?
The source material supports free/public availability through GitHub and install instructions, but it does not describe a commercial plan for witr itself. GitHub’s pricing page is present in the evidence set, but it is the platform’s pricing, not a product-specific paid plan.
Quick Facts
- Category
- Developer Tool
- Primary use
- Tracing why a process, port, container, or file is running
- Interface
- CLI and TUI
- Output modes
- Human-readable output and JSON
- Platforms
- Linux, macOS, FreeBSD, and Windows
- Source domain
- github.com
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