$ gcc -g test.c -o test
$ gdb test
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(gdb) l
1       #include <stdio.h>
2
3       int main(void) {
4           int i;
5           i = 10;
6           fprintf (stderr, "test\n");
7           return 0;
8       }
(gdb) b 5
Breakpoint 1 at 0x80483b5: file test.c, line 5.
(gdb) r
Starting program: /home/Alexander/test
Reading symbols from shared object read from target memory...done.
Loaded system supplied DSO at 0x70b000

Breakpoint 1, main () at test.c:5
5           i = 10;
(gdb) s
6           fprintf (stderr, "test\n");
(gdb) s
test
7           return 0;
(gdb) print i
$1 = 10
(gdb) q
The program is running.  Exit anyway? (y or n) y