Earlier quoted context omitted.
If you are looking for a non-joke implementation[0]. Excluding the test code at the bottom, the Rust version is a bit less than 120 lines. [0] https://github.com/uutils/coreutils/blob/main/src/uu/yes/src...
GNU core utils is 134 lines of code, not 50, so the Rust version is even slightly shorter. You can make yes a lot shorter in both C and Rust, but this size goes into speed. For reference, OpenBSD's yes is just 17 lines of code[2]. It essentially boils down to this: int main(int argc, char *argv[]) { if (pledge("stdio", NULL) == -1) err(1, "pledge"); if (argc > 1) for (;;) puts(argv[1]); else for (;;) puts("y"); } Thi…
That reddit thread has some amazing benchmarks.
The GNU-yes
$ yes | pv > /dev/null
... [10.2GiB/s] ...
void main() {
while(write(1, "y\n", 2)); // 1 is stdout
}
$ gcc yes.c -o yes
$ ./yes | pv > /dev/null
... [6.21 MiB/s] ...