It would be great to have a flag that didn't output anything in the case where no outdated apps were found (specifically, no apps that would show up in a "Found outdated apps" list). In normal operation this would then behave similarly to "brew upgrade".
Hiding output is easy, but I wouldn't want to hide actual useful (read: unexpected) output, and it doesn't seem to have a good way of differentiating between the two.
I'll second this. The "all installed list" is beautiful and would be nice to have available on demand, but just adds clutter in an update script output.
It would be great to have a flag that didn't output anything in the case where no outdated apps were found (specifically, no apps that would show up in a "Found outdated apps" list). In normal operation this would then behave similarly to "brew upgrade".
Hiding output is easy, but I wouldn't want to hide actual useful (read: unexpected) output, and it doesn't seem to have a good way of differentiating between the two.