karls-mac-mini:playground karl$ mkdir 1206287
karls-mac-mini:playground karl$ cd 1206287/
perl -MPath::Tiny -E 'path(q(folderA/folderB/folderC))->mkpath;'

karls-mac-mini:1206287 karl$ find . -type d
.
./folderA
./folderA/folderB
./folderA/folderB/folderC