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In Unix-like operating systems, unlink is a system call and a command line utility to delete files. The program directly interfaces the system call, which removes the file name and (but not on GNU systems) directories like rm and rmdir . [ 1 ]
Symbolic links are supported by POSIX and by most Unix-like operating systems, such as FreeBSD, Linux, and macOS. Limited support also exists in Windows 7 and Windows Vista, and to some degree in Windows 2000 and Windows XP in the form of shortcut files. CTSS on IBM 7090 had files linked by name in 1963.
unlink: Removes the specified file using the unlink function uptime: Tells how long the system has been running users: Prints the user names of users currently logged into the current host who: Prints a list of all users currently logged in whoami: Prints the effective userid: yes: Prints a string repeatedly
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.
rm (short for remove) is a basic command on Unix and Unix-like operating systems used to remove objects such as computer files, directories and symbolic links from file systems and also special files such as device nodes, pipes and sockets, similar to the del command in MS-DOS, OS/2, and Microsoft Windows.
The seven standard Unix file types are regular, directory, symbolic link, FIFO special, block special, character special, and socket as defined by POSIX. [1] Different OS-specific implementations allow more types than what POSIX requires (e.g. Solaris doors).
srm 1.2.8 on Mac OS X 10.9 [5] has a -n option, which means "overwrite file, but do not rename or unlink it." [ 1 ] However, if the file has multiple links, the multiple-link file data protection feature activates first, removing the file, even though the -n option specifies "do not rename or unlink the file". [ 3 ]
An n-component link L ⊂ S 3 is an unlink if and only if there exists n disjointly embedded discs D i ⊂ S 3 such that L = ∪ i ∂D i. A link with one component is an unlink if and only if it is the unknot. The link group of an n-component unlink is the free group on n generators, and is used in classifying Brunnian links.