/*
		EXECUTING AN APPLICATION USING EXEC COMMANDS

	The execlp() family of commands can be used to execute an
	application from a process. The system call execlp()
	replaces the executing process by a new process image
	which executes the application specified as its parameter.
	Arguments can also be specified. Refer to online man pages.
*/

#include <stdio.h>
#include <unistd.h>
#include <sys/ipc.h>

main()
{
	/*  "cal" is an application which shows the calendar of the
	    current year and month. "cal" with an argument specifying
	    year (for example "cal 1999") shows the calendar of that
	    year. Try out the "cal" command from your command prompt.

	    Here we execute "cal 2012" using the execlp() system call.
	    Note that we specify "cal" in the first two arguments. The
	    reason for this is given in the online man pages for execlp()
	*/

	execlp("cal","cal","2012",NULL); 

	/* The execlp() system call does not return. Note that the
	   following statement will not be executed.
	*/

	printf("This statement is not executed if execlp succeeds.\n");
}