[systemd-devel] Feature suggestion: journalctrl -b <n>

[Henrik /KaarPoSoft]

On 10/02/12 17:06, Lennart Poettering wrote:
> On Wed, 26.09.12 23:51, Henrik /KaarPoSoft (henrik at kaarposoft.dk) wrote:
>
>> Dear all,
>>
>> "journalctrl -b" shows messages from the current boot.
>>
>> However, I often find it useful to look at messages from the previous boot.
>>
>> Hence I would like to propose a new feature:
>> "journalctrl -b <n>"
>> should show messages from the n'th previous boot,
>> default being n=0, i.e. current boot.
>>
>> What do you think about this?
> Sounds like a good idea. Added this to the TODO list.
Great! Thank you.
>> PS:
>> It might also be useful to have an option to show all boot-ID's in
>> the journal,
>> maybe showing first and last timestamp of the log, and number of entries.
>> And maybe having an option like "journalctrl -b <boot-ID>"
> Yes, it is actually our plan to implement work-alikes for "last",
> "lastlog" and suchlike to systemd that simply take the data out of the
> journal for that. A similar tool could be one that inspects boot IDs
> like you suggest. To make this work nicely we need a minor update of the
> journal indexing logic however (which is already there in the format,
> but not implemented)
>
> Lennart
>