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The exec family of functions replaces the current running process with a new process.

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It can be used to run a C program by using another C program. It comes under the header file unistd.h. There are many members in the exec family which are shown below with examples. 

• execvp : Using this command, the created child process does not have to run the same program as the parent process does.

  The exec type system calls allow a process to run any program files, which include a binary executable or a shell script . 

Syntax: 

int execvp (const char *file, char *const argv[]);

• file: points to the file name associated with the file being executed. 
  argv:  is a null terminated array of character pointers.
  Let us see a small example to show how to use execvp() function in C.

  We will have two .C files , EXEC.c and execDemo.c and we will replace the execDemo.c with EXEC.c by calling execvp() function in execDemo.c .

• Now,create an executable file of EXEC.c using command 

gcc EXEC.c -o E

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