Using execve to Execute a New Program in UNIX

• int execve (const char *file, char *const argv [], char *const envp[]);

• int execl( const char *path, const char *arg, ...);

• int execlp( const char *file, const char *arg, ...);

• int execle( const char *path, const char *arg , ..., char * const envp[]);

• int execv( const char *path, char *const argv[]);

• int execvp( const char *file, char *const argv[]);

• exec.. execute a new program (same process id)

• The first argument is the new program
  if it says path, it requires a full pathname
  otherwise, it searches in the path

• Program arguments follow as a list or a vector

• execve and execle allow specifying the environment