ciopfs is a stackable or overlay linux userspace file system (implemented with FUSE) which mounts a normal directory on a regular file system in case insensitive fashion. The commands below should illustrate it’s function: mkdir -p ~/tmp/ciopfs/{.data,case-insensitive} ciopfs ~/tmp/ciopfs/.data ~/tmp/ciopfs/case-insensitive cd ~/tmp/ciopfs mkdir -p case-insensitive/DeMo/SubFolder echo demo >> case