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processx

Execute and Control System Processes

For agents: processx R package documentation for running and controlling external system processes, polling, and pseudo-terminals.

r packageprocess executionsubprocess controlpseudo terminalprocessx

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-23T15:43:54.418Z. Cached copy · Source on r-lib.org

# processx

> Execute and Control System Processes

Tools to run system processes in the background, read their standard
output and error and kill them.

processx can poll the standard output and error of a single process, or
multiple processes, using the operating system’s polling and waiting
facilities, with a timeout.

------------------------------------------------------------------------

- [Features](#features)
- [Installation](#installation)
- [Usage](#usage)
  - [Running an external process](#running-an-external-process)
    - [Errors](#errors)
    - [Showing output](#showing-output)
    - [Spinner](#spinner)
    - [Callbacks for I/O](#callbacks-for-io)
  - [Managing external processes](#managing-external-processes)
    - [Starting processes](#starting-processes)
    - [Killing a process](#killing-a-process)
    - [Standard output and error](#standard-output-and-error)
    - [End of output](#end-of-output)
    - [Polling the standard output and
      error](#polling-the-standard-output-and-error)
    - [Polling multiple processes](#polling-multiple-processes)
    - [Waiting on a process](#waiting-on-a-process)
    - [Exit statuses](#exit-statuses)
    - [Mixing processx and the parallel base R
      package](#mixing-processx-and-the-parallel-base-r-package)
    - [Errors](#errors-1)
- [Related tools](#related-tools)
- [Code of Conduct](#code-of-conduct)
- [License](#license)

## Features

- Start system processes in the background and find their process id.
- Read the standard output and error, using non-blocking connections
- Poll the standard output and error connections of a single process or
  multiple processes.
- Write to the standard input of background processes.
- Check if a background process is running.
- Wait on a background process, or multiple processes, with a timeout.
- Get the exit status of a background process, if it has already
  finished.
- Kill background processes.
- Kill background process, when its associated object is garbage
  collected.
- Kill background processes and all their child processes.
- Works on Linux, macOS and Windows.
- Lightweight, it only depends on the also lightweight R6 and ps
  packages.

## Installation

Install the stable version from CRAN:
…

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