fswatch is a file change monitor that detects and reports modifications to files and directories. The project's primary goal is to provide a cross-platform solution for monitoring file system events without requiring polling. fswatch achieves this by leveraging OS-specific APIs like inotify (Linux), kqueue (BSD), FSEvents (macOS), and the Windows API. It addresses the need for real-time awareness of file system changes in applications like build systems, content management systems, and monitoring tools, offering a more efficient alternative to constantly checking file modification times.
Key features include support for diverse operating systems and APIs, recursive directory monitoring with flexible path filtering, customizable event record formats, and the ability to monitor for periodic idle events. The project notably handles potential limitations of different monitors gracefully, such as kqueue's file descriptor limit and inotify's potential queue overflow. The emphasis on multi-platform support and configurable behavior makes it adaptable to a wide range of use cases.
- Cross-Platform Support: Provides monitoring capabilities on macOS, Linux, FreeBSD, Solaris, and Windows.
- Multiple Backends: Supports various file system event APIs (inotify, kqueue, FSEvents, Windows).
- Recursive Monitoring: Monitors changes in directories and their subdirectories.
- Path Filtering: Allows specifying include and exclude patterns using regular expressions.
- Customizable Events: Supports defining custom event record formats for specific needs.
- Periodic Idle Events: Enables monitoring for changes during idle periods for increased efficiency.
- Configuration Options: Allows fine-tuning of monitoring behavior like watch depth and event handling.
fswatch is an actively maintained project with regular releases and ongoing development. The project has a substantial number of stars and forks on GitHub, indicating a healthy community interest. Recent commits and issue activity suggest continued development and bug fixes. Comprehensive documentation, including a man page and a wiki, indicates a good level of documentation completeness.
Developers and system administrators benefit from fswatch by enabling real-time responses to file system changes. It’s valuable for automating tasks like rebuilding projects on file modification, triggering content updates, and monitoring file system events in various applications. Compared to manual file system monitoring or polling methods, fswatch offers improved efficiency and responsiveness, ensuring timely execution of actions based on file changes.