On Mon, Jul 27, 2020 at 07:42:31PM +0000, Rodolfo Medina wrote: > Must be so because > > $ zgrep "2018.*.install " /var/log/dpkg* > > gives no output and so with 2017, 2016 and 2015, whereas for 2019 and 2020 > there is output...
You can use ls -l to see the datestamps on the files. You can zcat the oldest one, and pipe that through head, to see the oldest entries in the oldest file. That'll tell you where your cutoff point is, more precisely than the datestamps (which will tell you the end of each individual file, but not the beginning).
