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  Include:   <process.h>, <errno.h>
 
  Syntax:    int execv( char *cmdname, char **argv );
             int execve( char *cmdname, char **argv, char **envp );
             int execvp( char *cmdname, char **argv );
             int execvpe( char *cmdname, char **argv, char **envp );
 
  Returns:   -1 if unsuccessful.
             errno: E2BIG, EACCES, EMFILE, ENOENT, ENOEXEC, ENOMEM
 
  See also:  abort, atexit, execl..., exit, _exit, onexit,
             spawnl..., spawnv..., system
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