In order to map one folder to another and allow SMB share follow these mappings you cannot use symlinks. Instead of symlinks mount command needs to be used.

eg: Map existing share Downloads (in folder /volume1/Downloads) to subfolder od Data share (/volume1/Data):

mkdir /volumne1/Data/Downloads
mount -o bind /volume1/Downloads /volume1/Data/Downloads

pokud unison lokálně funguje, ale přes SSH ne

ash: unison: not found

problém je pravděpodobně v tom, že $PATH neobsahuje cestu k binárce, což se dá ověřit pomocí

ssh remotehost 'echo $PATH'

Možnosti řešení:

1. Specify full path: ssh remotehost /full/path/unison
2. Extend path: ssh remotehost 'PATH=„$PATH:/full/path“ ; unison'
3. Set the path in ssh if PermitUserEnvironment is enabled in sshd configuration. Add the PATH to: ~/.ssh/environment
4. Execute the command inside a login shell on the NAS: ssh remotehost 'ash -l -c „unison“'

Zdroj: http://superuser.com/questions/666213/ash-command-not-found