On Do, 24.08.23 09:48, Cecil Westerhof (cldwester...@gmail.com) wrote: > In a service file I can use: > StandardOutput=append:/var/log/root/aptCacheUsage.log > > but I want to use something like: > StandardOutput=append:/var/log/root/aptCacheUsage_$(date +%%Y-%%m).log > > Did does not work, because this puts it in: > /var/log/root/aptCacheUsage_$(date +%Y-%m).log > > Is there a way I can put it in: > /var/log/root/aptCacheUsage_2023-08.log > > while it would automatically next month go into: > /var/log/root/aptCacheUsage_2023-09.log > > I could of-course put it into: > /var/log/root/aptCacheUsage.log > > and at the beginning of the month move it if it exists with a timed > service, but I really would not like that kind of solution.
We do not support this. systemd supports evaluating some specifiers, but time/date is not one of them, in particular as we resolve specifiers at parse time of the unit only, not afterwards. or in other words: we'd resolve the specifiers early at boot, and that doesn't look like what you want. Also, for long-running services this wouldn#t work anyway, as we can't rotate files like that, because we cannot externally close the current stdout of a process and replace it with a new file. hence, what you are trying to do is not supported, and is unlikely to ever be supported for multiple reasons. sorry! Lennart -- Lennart Poettering, Berlin
