fork() and exec() System Calls 

exec : execute a binary file and push arguments in. The stack Fork : used to eat food

EXCELLENT EXPLANATION ( hello from national technical university of Athens - Greece)

The Best Explanation for fork() and exec() I ever saw. Hats off Sir !!

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illustration with the mint terminal was extremely helpful. thanks for such great illustration

I got this, lessons on my class created the fear on me ! Thank you !

Thank You! So, fork() function creates a duplicate copy of the same program with different process id. The process who calls fork() is called parent process while the newly created process with exactly same contents and different process is called child process. Whereas exec() function is called with some argument by an already existing process. It replaces the existing process with the one referenced in argument. So the whole process is replaced by another with same process id of the older process. In fork (), process id changes while in exec(), process id remains the same. Fork produces duplicate while exec replaces the program.

After listening my proffesor`s meaningless and not understandable 3 hour fork() and exec() lessons, this video brings me to the moon man. Totally understand in

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forking hell, all clear now ... Thanks

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Great explanation as always although I couldn't understand why during the multiple forking example you explained, the 2nd last output statement included the terminal header('jaison@neso-acdemy.....')?

Can you please explain why the first program using fork() won't go into infinite loop ?

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This beats my 2 hours of a college course on the same topic. LoL

6:10 if you are using windows terminal , use ./a.exe

What was the purpose of passing the args array to exec?

Sir i think 8times the execution of system calls takesplace sir(fork)....loved ur teaching sir

In 3 fork() system call why after 6 times prints then enter press automatically and the 2 times prints

In exec, Which system call is used in second program to get back to the first program?

super