#!/bin/bash
user="admin"
address="IP"
#command will get devcie hostname in complex form
ssh $user@$address '/system identity print interval=' > devices

#will get device hostname
tmpDevices=$(cat devices)

device=$(echo $tmpDevices | awk ' {print $2} ')
echo "Device hostname is $device"

echo "Connecting to device via SFTP and downloading files"
#sftp "${user}@${address}:/${device}*"
sftp $user@$address:$device*

Device hostname is MikroTik
MikroTik
Connecting to device via SFTP and downloading files
Connected to 10.120.0.253.
File "/MikroTik" not found.