Combine multiple .h5ad files on command line?

[NaomiHuntley]

I would like to conduct an analysis using several tissues from the HUSCH single cell database since these have all been uniformly processed. I see that there is the r command to integrate datasets, but 1) I am not sure if that is appropriate here, and 2) I am wondering if there is a simpler way to combine these files because reading so many into r and then combining has been very slow.

Thank you!