Re: calling external programs
system() is fine for simple things. If you are looking for more
sophisticated interaction of the two programs
...or if security is an issue. system() uses the shell to launch the
command and that can be made to execute an arbitrary user-supplied
program in several different ways
you might want
to read about fork() and wait().
There is example code in the Linux manual page for wait - it just
needs modifying for the child to call execl() or some variant of it.