main() { fork(); printf(“Hello World!”); } Output for the above unix program is

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The fork creates a child that is a duplicate of the parent process. The child begins from the fork().All the statements after the call to fork() will be executed twice.(once by the parent process and other by child). The statement before fork() is executed only by the parent process

main() { fork(); printf(“Hello World!”); } Output for the above unix program is

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