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Please post what Operating System and version you are running and what Operating System and version your friend is running.
Please post what commands were used to compile the program on each...

A few items that stand out:
* execl will not do path lookup for "grep".
* read2 prototype doesn't agree with its definition
* fork returns pid_t which you are assigning to an int.

Either your...

Remember, both copies are identical except for the return value of fork(). There's absolutely nothing stopping them from continuing the loop if you don't stop them yourself.

You should make your...