I think parent wanted to write the following: int main() { printf("choo"); fork(); } Here, "choo" can be printed twice, even though we fork after prin

I think parent wanted to write the following: int main() { printf("choo"); fork(); } Here, "choo" can be printed twice, even though we fork after printing. This is a result from line buffering when the flush happens after the process is forked. Essentially, the output buffer is copied when forking and therefore duplicated.