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  Include:   <process.h>, <errno.h>
 
  Syntax:    int execl( char *cmdname, char *arg0, ...
                        char *argn, NULL );
 
             int execle( char *cmdname, char *arg0, ...
                         char *argn, NULL, char **envp );
 
             int execlp( char *cmdname, char *arg0, ...
                         char *argn, NULL );
 
             int execlpe( char *cmdname, char *arg0, ...
                          char *argn, NULL, char **envp );
 
  Returns:   -1 if unsuccessful.
             errno: E2BIG, EACCES, EMFILE, ENOENT, ENOEXEC, ENOMEM
 
  See also:  abort, atexit, execv..., exit, _exit, onexit,
             spawnl..., spawnv..., system
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