file management
File systems are an integral part of modern operating systems. File management is designed for computer software resources, including various system programs, various standard subprograms and a large number of application programs. These software resources are a collection of interrelated programs and data with a certain meaning, and they are regarded as files from the management point of view, saved on the storage medium and managed. At present, Linux mainly uses ext3 or ext2 file system.
Due to the use of virtual file system technology, linux can support a variety of file systems, such as UMSDOS, MSDOS, vfat, iso9660 of CD-ROM, NTFS, high-performance file system HPFT and NFS file system for network sharing. The so-called virtual file system is the interface between the operating system and the real file system. He converts the information of various file systems, forms a unified format, and then hands it to the Linux operating system for processing, and restores the result to the original file system format. For Linux, what it handles is a unified virtual file. system without needing to know the real file system the file is on.
Linux usually places the file system in a certain directory through a mount operation, so that different file systems can be combined into a whole and can easily share data with other operating systems.