Strace is a utility that can trace system calls. If you're wondering what system calls are, they are a translation mechanism that provides interface between a process and the operating system (kernel). These calls can be intercepted and read, allowing for a better understanding of what a process is trying to do at a given runtime.

"People are ignorant, but we already know that. As usual, I’ve read something really stupid on Twitter this morning. It said: I hope Apple will develop for everyone [every OS]. I think it would be one of the worst things to ever happen. Why do people want to install non-free software on free systems?

"... Open source is the term that was used in 1998 by people who liked our free software, but didn't like seeing as the ethical, political issues. They preferred to forget about the deeper aspects--the question of respecting the user's freedom--and focus only on the practical benefits that they got from having the freedom.

"Names convey meanings; our choice of names determines the meaning of what we say. An inappropriate name gives people the wrong idea. A rose by any name would smell as sweet—but if you call it a pen, people will be rather disappointed when they try to write with it. And if you call pens “roses”, people may not realize what they are good for. If you call our operating system “Linux”, that conveys a mistaken idea of the system's origin, history, and purpose. If you call it GNU/Linux, that conveys (though not in detail) an accurate idea..."

Many people make the mistake of thinking of Linux as just another Unix. Though most system calls are indeed identical, some of them aren’t. Knowing the difference is important.
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As I ate dinner at a recent LUG meeting, I found myself pleasantly surrounded by a group of people with the same intense passion. We all shared a thorough love for the beneficial and effective Linux operating system.

It is not enough to have Richard Stallman travel around the world endlessly giving standard Free Software speeches among other things repeating how Open Source is not the same thing as Free Software and how the operating system widely known as "Linux" is actually "GNU/Linux" (because GNU project in fact started that OS).

Linux is Free Software. Generally the average person tends to think of “Linux” as simply one operating system, but it’s rather a family of systems. Think of Linux and the various distributions as branches on the same tree-trunk.

"The GNU operating system is a complete free software system, upward-compatible with Unix. GNU stands for “GNU's Not Unix”. Richard Stallman made the Initial Announcement of the GNU Project in September 1983. A longer version called the GNU Manifesto was published in September 1985 [...] By 1990 we had either found or written all the major components except one—the kernel.