Linux Interview Questions: - How do you execute one program from within
another?
The system calls used for low-level process creation are
execlp() and execvp(). The execlp call overlays the existing program with the
new one , runs that and exits.
The original program gets back control only when
an error occurs. execlp(path,file_name,arguments..); //last argument must be
NULL A variant of execlp called execvp is used when the number of arguments is
not known in advance. execvp(path,argument_array); //argument array should be
terminated by NULL
