There isn't a pre-defined shortcut, but it is easy to add one:
1) Create tiddler $:/MyShortcuts/save-file, tagged with $:/tags/KeyboardShortcut, containing:
<$action-sendmessage $message="tm-save-wiki" />
2) add a field named "key", with a field value of:
3) Create another tiddler, $:/config/shortcuts/save-file, containing:
4) Create another tiddler, $:/config/ShortcutInfo/save-file, containing:
{{$:/language/Buttons/SaveWiki/Hint}}
Notes:
* step (1) defines the action to perform
* step (2) defines the binding to the keystroke definition in step (3)
* step (3) defines the keystroke combination to use
* step (4) defines the description of the shortcut
That's it. You can then use ctrl-shift-S to save the file.
enjoy,
-e