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gcc filename.c

GNU C compiler. Quite straight-forward if you know C. Extensive free manuals are available on the net.

How do I compile a simple C program?

Start your favourite text editor and type in your source code. For example, I may use pico:
pico hello.c

and type in the Kerningham and Richie (the creators of “c”) intro example of a C program:

#include <stdio.h>
void main(void) {
printf("hello world\n");
}

I save the file and then invoke the GNU C compiler to compile the file “hello.c”:
gcc hello.c

The gcc compiler produces an executable binary file “a.out”, which I can run:
./a.out