Passes the name of an image to be activated in a child process.
    This function is nonreentrant.

    Format

      #include  <unistd.h>

      int execv  (char *file_spec, char *argv[]);

1 - Arguments

 file_spec

    The full file specification of a new image to be activated in the
    child process.

 argv

    An array of pointers to null-terminated character strings.
    These strings constitute the argument list available to the new
    process. By convention, argv[0] must point to a string that is
    the same as the new process filename (or its last component).
    argv is terminated by a NULL pointer.

2 - Description

    See execl for a description of how the exec functions operate.

3 - Return Value

    -1                 Indicates failure.