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  2. Zero-byte file - Wikipedia

    en.wikipedia.org/wiki/Zero-byte_file

    An empty file has a minimum disk size that depends on the disk block size, which can also be referred to as cluster size or IO block size, that depends in turn on the filesystem. This IO block size can be discovered through different utilities in the operating system, such as stat in Unix systems. [2] [3] Typically 4096 bytes.

  3. Sparse file - Wikipedia

    en.wikipedia.org/wiki/Sparse_file

    In computer science, a sparse file is a type of computer file that attempts to use file system space more efficiently when the file itself is partially empty. This is achieved by writing brief information ( metadata ) representing the empty blocks to the data storage media instead of the actual "empty" space which makes up the block, thus ...

  4. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Convert and copy a file Version 5 AT&T UNIX delta: SCCS Optional (XSI) Make a delta (change) to an SCCS file PWB UNIX df: Filesystem Mandatory Report free disk space Version 1 AT&T UNIX diff: Text processing Mandatory Compare two files; see also cmp Version 5 AT&T UNIX dirname: Filesystem Mandatory

  5. Shell (computing) - Wikipedia

    en.wikipedia.org/wiki/Shell_(computing)

    On Unix-like systems, Secure Shell protocol (SSH) is usually used for text-based shells, while SSH tunneling can be used for X Window System–based graphical user interfaces (GUIs). On Microsoft Windows, Remote Desktop Protocol can be used to provide GUI remote access, and since Windows Vista , PowerShell Remote can be used for text-based ...

  6. mkfs - Wikipedia

    en.wikipedia.org/wiki/Mkfs

    In computer operating systems, mkfs is a command used to format a block storage device with a specific file system. The command is part of Unix and Unix-like operating systems. In Unix, a block storage device must be formatted with a file system before it can be mounted and accessed through the operating system's filesystem hierarchy.

  7. Bash (Unix shell) - Wikipedia

    en.wikipedia.org/wiki/Bash_(Unix_shell)

    While Bash was developed for UNIX and UNIX-like operating systems, such as GNU/Linux, [20] it is also available on Android, macOS, Windows, and numerous other current and historical operating systems. "Although there have been attempts to create specialized shells, the Bourne shell derivatives continue to be the primary shells in use."

  8. List of FTP commands - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_commands

    Accept the data and to store the data as a file at the server site STOU RFC 959 Store file uniquely. STRU RFC 959 Set file transfer structure. SYST RFC 959 Return system type. THMB Streamlined FTP Command Extensions: Get a thumbnail of a remote image file TYPE RFC 959 Sets the transfer mode (ASCII/Binary). USER RFC 959 Authentication username. XCUP

  9. df (Unix) - Wikipedia

    en.wikipedia.org/wiki/Df_(Unix)

    The total amount of space allocated to existing files in the file system, in 512-byte units. <space free> The total amount of space available within the file system for the creation of new files by unprivileged users, in 512-byte units. When this figure is less than or equal to zero, it shall not be possible to create any new files on the file ...