CASH: A category-based file management system

File management remains a hot topic because file creation, retrieval and deletion are such basic aspects for all computer users in their daily life. Here, we are dedicated to develop a file management system, CASH, to effectively and efficiently organize, manage, maintain, and search tremendous amount of electronic files based on latest database technologies, so users can easily find the exact files they seek. CASH is a category-based shell, which is developed from TCSH. In this system, users manage their data by using files and categories, instead of files and directories in conventional file systems. Unlike directory-based file systems, CASH allows a file to be classified to more than one category, and a category could also have multiple parent categories. These features make it much more flexible to place or locate a file. CASH develops a set of commands, and defines several rules to create, update, and delete a category hierarchy, and the categorization of files. Moreover, it extends some existing Unix commands, whose execution will affect the information of some files, to update the database immediately.