[post-it]

Multiple levels of logging, all of which you want to capture but not all in the same place.

[skydhash]

Wasn't the idiomatic way the `-v` flag (repeated for verbosity). And then stderr for errors (maybe warning too).

[notpushkin]

It is, and all logs should ideally go to stderr. But that doesn’t let you pipe them to different places.

[post-it]

Yes, but sometimes you want just important non-error logs to go to the console or journal, and then those plus verbose logs to go to a file that gets rotated, and then also stderr on top of that.