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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 contains a text string that is automatically interpreted and followed by the operating system as a path to another file or directory. This other file or directory is called the "target". The symbolic link is a second file that exists independently of its target. If a symbolic link is deleted, its target remains unaffected.
It can be manipulated using several calls from the C header file linux/debugfs.h, which include: debugfs_create_file – for creating a file in the debug filesystem. debugfs_create_dir – for creating a directory inside the debug filesystem. debugfs_create_symlink – for creating a symbolic link inside the debug filesystem.
Example: If standing in a dir /home/symlinked, that is a symlink to /home/realdir, this would show /home/realdir pwd -L: Display the current working directory logical path - with symbolic link name, if any. Example: If standing in a dir /home/symlinked, that is a symlink to /home/realdir, this would show /home/symlinked
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 ...
An NTFS symbolic link is not the same as a Windows shortcut file, which is a regular file. The latter may be created on any filesystem (such as the earlier FAT32 ), may contain metadata (such as an icon to display when the shortcut is viewed in Remove links), and is not transparent to applications.
The kernel assigns each process a symbolic link per namespace kind in /proc/<pid>/ns/. The inode number pointed to by this symlink is the same for each process in this namespace. This uniquely identifies each namespace by the inode number pointed to by one of its symlinks.