One day, on a legacy Linux system, logrotate managed to skip some files in the middle of a sequence in /var/log.
Since I didn’t have time to sort out the cause (the system was being phased out), I used this to compress the rest of the log-files (dated in 2017):
sudo -u bash
pushd /var/log
ls | grep -vw xz | grep "\-20......$" | xargs -L 1 ls -alh
After that you can execute this in the same directory:
ls | grep -vw xz | grep "\-20......$" | xargs -L 1 time xz
It skips any xz files and includes only files in the year 2017.
I occasionally tracked progress with this:
ls -alh /var/log/ | grep -v xz | less
That got back a few gigabytes of disk space, just enough to help me migrate the system away.
–jeroen
The Wiert Corner - irregular stream of stuff 