Answer Posted / rahul magdum

#include sys/types.h
#include unistd.h
#include sys/stat.h

main()
{
Int pid=fork();
Int fd=creat("op.txt",S_IRWXU);
If(pid!=0 && pid!=-1)
{
close(1); // stdout
dup(fd); // replace file descriptor
execlp("ls","ls","-l",null);
close(fd);

}
}

Tell me how to protect a process from others to kill?

520

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Explain the mount and unmount system calls?

533

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Name the command which is used to execute system calls from exe?

513

---

Explain the difference between command and utility in unix?

505

---

The very first process created by the kernel in unix is?

478

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How to protect a process from others to kill?

540

---

What is the difference between command and utility in unix?

497

---

Explain the unmount system calls?

541

---

What is the fork() system call?

550

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Explain c program to implement the unix or linux command to implement ls -l >output.txt?

458

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What are the possible return values of kill() system call?

504

---

Explain the mount system calls?

572

---

What is the first process created by the kernel in unix?

490

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