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My aim is to have the janitor running at startup, with a pre-configured profile (e.g. clean old packages and empty the browser cache), much like CCleaner's /AUTO parameter on Windows.

The website is lacking any documentation or usage instructions, and I could not find any information on this here on AskUbuntu as well.

I tried, naturally, to start Ubuntu Tweak from the command line, hoping additional API exists that will come through in this (allegedly) simple task.

I only got as far as:

ubuntu-tweak -f janitor

which is a step in the right direction, but what's still missing is a command for the clear action. Is such a command available, or is there any better way of achieving the described behavior?

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up vote 3 down vote accepted

for the moment the answer is no...

Let me expand on that statement.

In many ways, your question is similar to this Q&A:

Ubuntu Tweak only offers (currently) a limited API call for the executable itself.

Therefore - when trying to invoke a Ubuntu-Tweak feature when starting from startup applications or via a quick list, you can only use the command line parameters that have been made available.

ubuntu-tweak -f janitor is one such feature. There are no command-line parameters (currently) for what you are seeking to do.

You can test this yourself by running ubuntu-tweak -h. The linked answer above shows the typical result you could expect.

Some programs - once running - expose an interface such as dbus that allows you to invoke features via an external program. Rhythmbox is one such software with its rhythmbox-client which can be called externally. Ubuntu-tweak unfortunately does not offer the same external interface.

What you'll need to do is submit a patch to the author that would add a command-line parameter to do the function you are seeking.

Alternatively - add an externally callable interface such as dbus when ubuntu-tweak is actually running.

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