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It would be useful to have a property to set key value pairs in /etc/default configs.  The code is in Grub.configured.  I have not written a patch yet because I am not sure what the module should be called.  Possibilities are:

    & EtcDefault.set "anacron" "ANACRON_RUN_ON_BATTERY_POWER" "no"

or maybe

    & ConfFile.hasShellSetting "/etc/default/anacron" ("ANACRON_RUN_ON_BATTERY_POWER", "no")

Or possibly both of these, with the former implemented in terms of the latter.

Notes:

* The use of a tuple for the last two parameters ensures that the property can be used infix.

* I think this property should deduplicate the config key after setting it.  I.e. after uncommenting and modifying ANACRON_RUN_ON_BATTERY_POWER it should remove any further ANACRON_RUN_ON_BATTERY_POWER settings further down the config.  This allows a seamless transition from just using File.containsLine to add to the end of the file.

--spwhitton