https://www.linuxfordevices.com/tutorials/linux/strace-command
The strace command is a powerful debugging and diagnostic tool in Linux. It records every system call and the response it receives by a particular process. It is similar to the truss tool in other Unix-like operating systems. So, you can debug a program without needing to read its code. It is also a great tool to learn about system calls.
A system call is like an interface through which a software requests a service from the kernel.
System Calls
There are a lots of system calls in an operating system, but to learn about them is beyond the scope of this article.
标签：Strace,tool,learn,system,命令,call,Linux From： https://www.cnblogs.com/freeliver54/p/17069511.html