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Symbolic links operate transparently for many operations: programs that read or write to files named by a symbolic link will behave as if operating directly on the target file. However, they have the effect of changing an otherwise hierarchic filesystem from a tree into a directed graph, which can have consequences for such simple operations as ...
This also leads to an aliasing effect: writes to a link will pass the write to the underlying, linked file or MFT entry. Symbolic links and junction points contain the path to the linked file, and a tag identifying the driver which implements the behaviour. Because they record the path, they can link to files on other volumes or even remote files.
The open source NTFS-3G driver implements built-in support for the link-type reparse points, namely symbolic links and junction points. A plugin filter system is available to handle additional types of reparse points, allowing for chunk-deduplicated files, system-compressed files, and OneDrive files to be read.
The ln command is a standard Unix command utility used to create a hard link or a symbolic link (symlink) to an existing file or directory. [1] The use of a hard link allows multiple filenames to be associated with the same file since a hard link points to the inode of a given file, the data of which is stored on disk.
A symbolic link is a reference to another file. This special file is stored as a textual representation of the referenced file's path (which means the destination may be a relative path, or may not exist at all). A symbolic link is marked with an l (lower case L) as the first letter of the mode string, e.g. in this abbreviated ls -l output: [5]
A malicious user can create a symbolic link to a file not otherwise accessible to them. When the privileged program creates a file of the same name as the symbolic link, it actually creates the linked-to file instead, possibly inserting content desired by the malicious user (see example below), or even provided by the malicious user (as input ...
Multiple names in the file system may refer to the same file, a feature termed a hard link. [1] The mathematical traits of hard links make the file system a limited type of directed acyclic graph, although the directories still form a tree, as they typically may not be hard-linked. (As originally envisioned in 1969, the Unix file system would ...
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.