If process substitution doesn't work, shouldn't /dev/stdin work? I haven't tried it, but as long as b2 doesn't try to check the file size before uploading I don

If process substitution doesn't work, shouldn't /dev/stdin work? I haven't tried it, but as long as b2 doesn't try to check the file size before uploading I don't see why it wouldn't work: b2 upload_file bucket /dev/stdin < file