Force transmission-daemon to update `settings.json`

[intuited]

Is there a way to get transmission-daemon to update (write) its settings file?

[gunzip]

Is there a way to get transmission-daemon to update (write) its settings file?

yes, from https://trac.transmissionbt.com/wiki/EditConfigFiles :

Reload Settings

You can make the daemon reload the settings file by sending it the SIGHUP signal.
Or, simply run either of the following commands:

$ killall -HUP transmission-daemon

Or:

$ pkill -HUP transmission-daemon

[rb07]

gunzip
He asked about writing the configuration file, you responded with the command for reloading the possibly changed file.

[Jordan]

There's not a way to force settings.json to be written to disk on-demand.