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exec*
=====

Syntax
------

     #include <unistd.h>
     
     int execl(const char *path, const char *argv0, ...);
     int execle(const char *path, const char *argv0, ... /*, char *const envp[] */);
     int execlp(const char *path, const char *argv0, ...);
     int execlpe(const char *path, const char *argv0, ... /*, char *const envp[] */);
     
     int execv(const char *path, char *const argv[]);
     int execve(const char *path, char *const argv[], char *const envp[]);
     int execvp(const char *path, char *const argv[]);
     int execvpe(const char *path, char *const argv[], char *const envp[]);

Description
-----------

These functions operate by calling `spawn*' with a type of `P_OVERLAY'.
Refer to spawn*: for a full description.   

Return Value
------------

If successful, these functions do not return.  If there is an error,
these functions return -1 and set `errno' to indicate the error.

Example
-------

     execlp("gcc", "gcc", "-v", "hello.c", 0);