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The most common modern use of the sticky bit is on directories residing within filesystems for Unix-like operating systems. When a directory's sticky bit is set, the filesystem treats the files in such directories in a special way so only the file's owner, the directory's owner, or root can rename or delete the file.
The file system permissions of a symbolic link are not used; the access modes of the target file are controlled by the target file's own permissions. Some operating systems, such as FreeBSD, offer the ability to modify file permissions and filesystem attributes of a symbolic link, through lchmod [12] and lchflags [13] system calls respectively.
shred is a command on Unix-like operating systems that can be used to securely delete files and devices so that it is extremely difficult to recover them, even with specialized hardware and technology; assuming recovery is possible at all, which is not always the case.
FreeBSD supports POSIX.1e ACLs on UFS, and NFSv4 ACLs on UFS and ZFS. [5] [6] IBM z/OS implements file security using RACF (Resource Access Control Facility) [7] The AmigaOS Filesystem, AmigaDOS supports a permissions system relatively advanced for a single-user OS. In AmigaOS 1.x, files had Archive, Read, Write, Execute and Delete ...
To implement a new file system, a handler program linked to the supplied libfuse library needs to be written. The main purpose of this program is to specify how the file system is to respond to read/write/stat requests. The program is also used to mount the new file system. At the time the file system is mounted, the handler is registered with ...
In AmigaOS, a lock on a file (or directory) can be acquired using the Lock function (in the dos.library). A lock can be shared (other processes can read the file/directory, but can't modify or delete it), or exclusive so that only the process which successfully acquires the lock can access or modify the object.
chattr is the command in Linux that allows a user to set certain attributes of a file. lsattr is the command that displays the attributes of a file.. Most BSD-like systems, including macOS, have always had an analogous chflags command to set the attributes, but no command specifically meant to display them; specific options to the ls command are used instead.
libarchive was originally developed for FreeBSD, but is also used in NetBSD and macOS as part of those operating systems. [5] bsdtar has been included in Windows since Windows 10 April 2018 Update. [12] In May 2023, Microsoft announced Windows 11 will natively support additional archive formats such as 7z and RAR via libarchive. [13]