I'm using tree on a directory which has -- among other things -- some Audacity projects in it. Each Audacity project is some file X.aup, along side a directory X_data, which contains a few sub-directories, and dozens of *.au files.
What I'd like to do is have tree display the X_data folder, so I know it's there, but not descend into it.
I could omit the directory entirely with tree -I '*_data' --matchdirs, or I could omit what appears to be the only child directory of these *_datas: tree -I 'e??' --matchdirs (of course, that's likely to be too broad), but what I'd like to do is tree -I '*_data/*' (which doesn't work).