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### 5.3 Declaring multiple hops in the file name

TRAMP file name syntax can accommodate ad hoc specification of multiple proxies without using `tramp-default-proxies-alist` configuration setup(see Multi-hops).

Each proxy is specified using the same syntax as the remote host specification minus the file name part. Each hop is separated by a ‘`|`’. Chain the proxies from the starting host to the destination remote host name and file name. For example, hopping over a single proxy ‘`bird@bastion`’ to a remote file on ‘`you@remotehost`’:

    C-x C-f /ssh:bird@bastion|ssh:you@remotehost:/path

Proxies can take patterns `%h` or `%u`.

TRAMP adds the ad-hoc definitions on the fly to `tramp-default-proxies-alist` and is available for re-use during that Emacs session. Subsequent TRAMP connections to the same remote host can then use the shortcut form: ‘`/ssh:you@remotehost:/path`’.

User Option: tramp-save-ad-hoc-proxies

  For ad-hoc definitions to be saved automatically in `tramp-default-proxies-alist` for future Emacs sessions, set `tramp-save-ad-hoc-proxies`.

      (setq tramp-save-ad-hoc-proxies t)