lsof VS Glsof

Overall verdict

• lsof (List Open Files) is a mature, battle-tested Unix/Linux utility that reliably reveals which files, sockets, and resources are opened by processes, making it an indispensable diagnostic tool for system administrators and developers.

Why this product is good

• Provides comprehensive visibility into open files, network sockets, pipes, and devices tied to running processes
• Extremely useful for troubleshooting 'device busy' errors, port conflicts, and locating processes holding onto deleted files
• Highly portable across many Unix-like systems including FreeBSD, Linux, macOS, and Solaris
• Long history of stable, well-maintained releases with extensive documentation and community support
• Powerful filtering options let you query by user, process, port, file, or network connection

Recommended for

• System administrators diagnosing resource and file-locking issues
• Developers debugging network connections and socket usage
• Security professionals investigating suspicious process activity and open network ports
• Anyone needing to identify which process is using a specific file, directory, or port before unmounting or killing

Overall verdict

• GLSOF is a solid, free graphical front-end for the powerful lsof and gcc-based tools on Unix/Linux systems, offering an accessible way to inspect open files and network connections without memorizing complex command-line syntax.

Why this product is good

• Provides a user-friendly graphical interface (Queries and Myps tools) on top of the command-line lsof utility
• Free and open source, hosted on SourceForge with no licensing costs
• Helps visualize open files, processes, and network connections in real time
• Useful for troubleshooting, security auditing, and understanding system resource usage
• Cross-platform support for various Unix-like operating systems

Recommended for

• System administrators who need to monitor open files and network connections
• Users who prefer a GUI over memorizing lsof command-line options
• Security analysts investigating processes and file usage
• Developers debugging resource leaks or file handle issues
• Linux and Unix enthusiasts learning about system internals