[bug#47163] [PATCH] refresh: Add '--installed' option.

[Xinglu Chen]

On Tue, Mar 16 2021, Ludovic Courtès wrote:

>>> I sometimes run:
>>>
>>>   guix refresh $(guix package -I | cut -f1)
>>>
>>> I’m not sure an extra ‘guix refresh’ option is warranted.  WDYT?
>>
>> That's cool, I think your solution would suffice.  Maybe we could add it
>> to the manual or cookbok?
>
> That’s a good idea.  Do you want to propose a short section on this?

Sure, I will send a followup patch to this.