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Such directories are optional, but if they exist, they have some requirements. /media: Mount points for removable media such as CD-ROMs (appeared in FHS-2.3 in 2004). /mnt: Temporarily mounted filesystems. /opt: Add-on application software packages. [7] /proc: Virtual filesystem providing process and kernel information as files. In Linux ...
The proc filesystem (procfs) is a special filesystem in Unix-like operating systems that presents information about processes and other system information in a hierarchical file-like structure, providing a more convenient and standardized method for dynamically accessing process data held in the kernel than traditional tracing methods or direct access to kernel memory.
It is a clone of SGI's fsn file manager for IRIX systems, aimed to run on modern Linux and other Unix-like operating systems. [1] It is capable of representing file systems in two ways: MapV mode: files and directories are represented as cuboids of equal height, with the size of the cuboid representing the size of the file or directory.
XFS is a 64-bit file system [24] and supports a maximum file system size of 8 exbibytes minus one byte (2 63 − 1 bytes), but limitations imposed by the host operating system can decrease this limit. 32-bit Linux systems limit the size of both the file and file system to 16 tebibytes.
Both directories and files are stored as extents, which are sequential series of sectors. Files and directories are differentiated only by a file attribute that indicates its nature (similar to Unix). The attributes of a file are stored in the directory entry that describes the file, and optionally in the extended attribute record.
The compression algorithm and cluster size is specified on a per-file basis. Directories can also be marked for compression, in which case every newly created file in the directory will be automatically compressed with the same cluster size and the same algorithm that was specified for the directory. e2compr is not a new file system.
By default, the Single UNIX Specification (SUS) specifies that du is to display the file space allocated to each file and directory contained in the current directory. Links will be displayed as the size of the link file, not what is being linked to; the size of the content of directories is displayed, as expected.
Directory (D): The entry is a subdirectory, containing file and directory entries of its own. Reparse Point (L): The file or directory has an associated re-parse point, or is a symbolic link . Offline (O): The file data is physically moved to offline storage (Remote Storage).