A file system such as the hierarchically structured POSIX file system offers you several advantages:
You can structure your data resources better.
You can work with every file or directory in the entire file system, provided you have access permission for the corresponding file or directory (see “Access protection for files and directories”).
Files can be easily transferred from the current directory to another. Three options are provided for this purpose:
You can physically copy a file to another directory with the POSIX command cp (copy); several physical copies of the file are then available.
You can alternatively transfer only the name of a file to another directory by means of the POSIX command ln (link). Several references to this file exist, but only one copy of the file exists physically.
You can rename a file or move it to another location in the directory tree by means of the POSIX command mv (move). mv creates no physical copy of the relocated or renamed file within a file system; it only modifies the entries in the superordinate directory.
The POSIX commands cp, ln and mv are described in detail in the "POSIX Commands [1] manual.
You can write your files to one or more directories. Consequently, files can be organized clearly and logically.
Several files with the same name can be available in the same file system. However, the files must be stored in different directories.