Hierarchical File System
A hierarchial file system (HFS) is a type of z/OS UNIX file system,
which mounts when the system IPLs. The HFS consists of the following:
- HFS files, which contain data or programs. A file containing a load module or
shell script or REXX program is called an executable file. Files are kept in
directories.
- Directories that contain files, other directories, or both. Directories are arranged
hierarchically, in a structure that resembles an upside-down tree, with the root
directory at the top and the branches at the bottom. The root is the first directory
for the file system at the top of the tree and is designated by a slash (/).
- Additional local or remote file systems, which are mounted on directories of the
root file system or of additional file systems.