print_columns
print_columns(shl_stdout, NSIG - 1,
print_columns(shl_out, n, plain_fmt_entry, (void *) ap, nwidth + 1, 0);
print_columns(shl_out, n, select_fmt_entry, (void *) &smi,
print_columns(shl_stdout, n, options_fmt_entry, &oi,
void print_columns(struct shf *, int, char *(*)(void *, int, char *, int),