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$ gdb main
(gdb) break 12
Breakpoint 1 at 0x100001234: file main.c, line 12.
(gdb) run
Breakpoint 1, main () at main.c:12
12      int main(int argc, char *argv[]) {
(gdb) print argc
$1 = 1
(gdb) step
13      printf("Hello, world!\n");
(gdb) continue
Continuing.
Program exited with code 0.

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