F_STDERR
t->t_dflg |= F_STDERR;
t->t_dflg |= F_STDERR, p = p->next;
if (t->t_dflg & F_STDERR)
if (t->t_dflg & F_STDERR)
(t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
if (flags & F_STDERR) {