strace

strace is a diagnostic, debugging, and instructional command-line tool for Linux that monitors system calls and signals made by a process. It traces the interactions between a program and the kernel, capturing details like file operations, network activity, and process management. This makes it invaluable for troubleshooting performance issues, debugging crashes, or understanding program behavior at a low level.

Also known as: system call trace, strace command, strace utility, Linux strace, syscall tracer

Why learn strace?

Developers should learn strace when debugging complex issues in Linux applications, such as unexplained crashes, high latency, or permission errors, as it reveals the exact system calls involved. It's particularly useful for security auditing, performance profiling, and reverse-engineering software where source code is unavailable. Common use cases include diagnosing file I/O bottlenecks, tracking down memory leaks, or verifying network connections in server applications.

Learning Resources

• docs: strace man page
• tutorial: Brendan Gregg's strace Examples
• tutorial: Linux strace Command Tutorial for Beginners
• tutorial: Debugging with strace - Red Hat Developer