reattach-to-user-namespace ☆

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Description:
Reattach process (e.g., tmux) to background

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: tmux macos clipboard terminal utility

Install: brew install reattach-to-user-namespace

About:
ReattachToUserNamespace is a helper utility that enables tmux and other terminal multiplexers to interact with the macOS pasteboard system. It solves the problem where background sessions cannot access the user's graphical clipboard by reattaching a process to the per-user OS X namespace. This allows for seamless copy and paste functionality between terminal applications running inside tmux and native Mac GUI applications.

Key Features:

Enables clipboard access for tmux sessions on macOS
Lightweight and simple to use
Solves a core limitation of terminal multiplexers on OS X
Provides a bridge between background processes and the user session

Use Cases:

Using copy/paste (pbcopy/pbpaste) from within a tmux session
Running long-lived processes that need clipboard access
Integrating with scripts that require GUI interaction from terminal

Alternatives:

reattach-to-user-namespace – This is the same tool; it is the standard solution for this specific problem.

Version History

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