# on host, create named container
```docker run -it --name 123deb debian```
# in container, create file in /tmp
```echo "hallo ASYD" > /tmp/123.txt```
# ... and exit from container
```exit```

# find the file by name starting in /var/lib/docker/
```sudo find /var/lib/docker/ -name 123.txt```
# print the file contents
```sudo cat $(sudo find /var/lib/docker/ -name 123.txt)```