wait_on ☆
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Description:
Provides shell scripts with access to kqueue(3)
Type: Formula  |  Latest Version: 1.1@0  |  Tracked Since: Oct 30, 2025
Links: Homepage  |  formulae.brew.sh
Category: System utilities
Tags: kqueue shell-scripting cli monitoring event-driven
Install: brew install wait_on
About:
wait_on is a command-line utility that leverages the kqueue(3) system call to monitor file descriptors for events. It allows shell scripts to efficiently wait for I/O readiness, process termination, or signal events without busy-waiting. This provides a lightweight and highly efficient alternative to polling-based methods for event-driven scripting.
Key Features:
  • Monitors file descriptors for read/write readiness using kqueue
  • Watches for process exit events
  • Supports signal event notification
  • Designed for use in shell scripts and command pipelines
Use Cases:
  • Building efficient, event-driven shell scripts
  • Monitoring multiple processes or network sockets concurrently
  • Creating responsive daemons or service supervisors
Alternatives:
  • inotifywait – Linux-specific, focused on filesystem events; wait_on is more general (I/O, processes, signals) and uses kqueue (BSD/macOS).
  • poll – Standard POSIX utility; less efficient and lacks integrated process/signal monitoring compared to wait_on's kqueue integration.
Version History
Detected Version Rev Change Commit
Oct 30, 2025 7:30pm 0 VERSION_BUMP ba5a1e48
Aug 9, 2024 7:36pm 0 VERSION_BUMP 7e7c76eb
Sep 18, 2023 10:33pm 0 VERSION_BUMP 48a312e3
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