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Linux, FreeBSD and NetBSD [citation needed] OverlayFS is a union mount filesystem implementation for Linux. It combines multiple different underlying mount points into one, resulting in single directory structure that contains underlying files and sub-directories from all sources.
In the Plan 9 operating system from Bell Labs (mid-1980s onward), union mounting is a central concept, replacing several older Unix conventions with union directories; for example, several directories containing executables, unioned together at a single /bin directory, replace the PATH variable for command lookup in the shell.
Unionfs is a filesystem service for Linux, FreeBSD and NetBSD which implements a union mount for other file systems.It allows files and directories of separate file systems, known as branches, to be transparently overlaid, forming a single coherent file system.
The mount command instructs the operating system that a file system is ready to use, and associates it with a particular point in the overall file system hierarchy (its mount point) and sets options relating to its access. Mounting makes file systems, files, directories, devices and special files available for use and available to the user.
Modern Linux distributions include a /sys directory as a virtual filesystem (sysfs, comparable to /proc, which is a procfs), which stores and allows modification of the devices connected to the system, [20] whereas many traditional Unix-like operating systems use /sys as a symbolic link to the kernel source tree.
FUSE was merged into the mainstream Linux kernel tree in kernel version 2.6.14. [8] The userspace side of FUSE, the libfuse library, generally followed the pace of Linux kernel development while maintaining "best effort" compatibility with BSD descendants. This is possible because the kernel FUSE reports its own "feature levels", or versions.
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The name systemd adheres to the Unix convention of naming daemons by appending the letter d. [9] It also plays on the term "System D", which refers to a person's ability to adapt quickly and improvise to solve problems. [10] Since 2015, the majority of Linux distributions have adopted systemd, having replaced other init systems such as SysV ...