How is GNU `yes` so fast?
Speed vs readability:<p><a href="https://github.com/coreutils/coreutils/blob/master/src/yes.c" rel="nofollow">https://github.com/coreutils/coreutils/blob/master/src/yes.c</a><p><a href="https://github.com/openbsd/src/blob/master/usr.bin/yes/yes.c" rel="nofollow">https://github.com/openbsd/src/blob/master/usr.bin/yes/yes.c</a>