x_prev_com
kb_add(x_prev_com, CTRL('P'), 0);
kb_add(x_prev_com, CTRL('X'), 'A', 0);
kb_add(x_prev_com, CTRL('['), '[', 'A', 0); /* up */
kb_add(x_prev_com, CTRL('['), 'O', 'A', 0); /* up */
static int x_prev_com(int);
{ x_prev_com, "up-history", XF_ARG },