@node exec*, process
@subheading Syntax

@example
#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[]);
@end example

@subheading Description

These functions operate by calling @code{spawn*} with a type of
@code{P_OVERLAY}.  Refer to @ref{spawn*} for a full description. 

@subheading Return Value

If successful, these functions do not return.  If there is an error,
these functions return -1 and set @code{errno} to indicate the error. 

@subheading Portability

@portability !ansi, posix

@subheading Example

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