[scenario 4] Use `2>&1` instead of `&>` for error redirection

The `&>` is non portable and for Bash > 4 only.

Instead of:

```bash
grep foo /shared/data/bank/homo_sapiens &> sdt_out_and_log.txt
```

we should have

```bash
grep foo /shared/data/bank/homo_sapiens 2>&1 >sdt_out_and_log.txt
```