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Fsck
The system utility fsck (''file system check'') is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, pac ..., macOS, and FreeBSD. "In actuality, fsck is simply a front-end for the various filesystem checkers (fsck.fstype) available under Linux." The equivalent programs on MS-DOS and Microsoft Windows are CHKDSK, System File Checker, SFC, and SCANDISK. Use Generally, fsck is run either automatically at boot time, or manually by the system administrator. The command works directly on data structures stored on disk, which are internal and specific to the particular file system in use - so an fsck command tailored to the file system is generally required. The exact behaviors of variou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuck
''Fuck'' () is profanity in the English language that often refers to the act of sexual intercourse, but is also commonly used as an intensifier or to convey disdain. While its origin is obscure, it is usually considered to be first attested to around 1475. In modern usage, the term ''fuck'' and its morphological derivation, derivatives (such as ''fucker'' and ''fucking'') are used as a noun, a verb, an adjective, an Expletive infix, infix, an interjection or an adverb. There are many common phrases that employ the word as well as Compound (linguistics), compounds that incorporate it, such as ''motherfucker'' and ''wikt:fuck off, fuck off''. Offensiveness It is unclear whether the word has always been considered a pejorative or, if not, when it first came to be used to describe (often in an extremely angry, hostile, or belligerent manner) unpleasant circumstances or people in an intentionally offensive way, such as in the term ''motherfucker'', one of its more common usages in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unix File System
The Unix file system (UFS) is a family of file systems supported by many Unix and Unix-like operating systems. It is a distant descendant of the original filesystem used by Version 7 Unix. Design A UFS volume is composed of the following parts: * A few blocks at the beginning of the partition reserved for boot blocks (which must be initialized separately from the filesystem) * A superblock, containing a magic number identifying this as a UFS filesystem, and some other vital numbers describing this filesystem's geometry and statistics and behavioral tuning parameters * A collection of cylinder groups. Each cylinder group has the following components: ** A backup copy of the superblock ** A cylinder group header, with statistics, free lists, etc., about this cylinder group, similar to those in the superblock ** A number of inodes, each containing file attributes ** A number of data blocks Inodes are numbered sequentially, starting at 0. Inode 0 is reserved for unalloc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soft Updates
Soft updates is an approach to maintaining file system metadata integrity in the event of a crash or power outage. Soft updates work by tracking and enforcing dependencies among updates to file system metadata. Soft updates are an alternative to the more commonly used approach of journaling file systems. Method of operation Soft updates allow only asynchronous metadata writes that do not render the on-disk file system inconsistent, or that the only inconsistency that ever happens is a storage space leak (space marked allocated when not used by any file). It avoids having to do ordered synchronous metadata writes by temporarily "rolling back" any part of a metadata block that depends on another potentially non-flushed or partially rolled-back block when writing it. In effect, blocks may be flushed at any time and the soft updates code will always provide the disk a consistent version of the metadata (as long as it knows which blocks have physically been flushed). Recovery th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Data Scrubbing
Data scrubbing is an error correction technique that uses a background task to periodically inspect main memory or storage for errors, then corrects detected errors using redundant data in the form of different checksums or copies of data. Data scrubbing reduces the likelihood that single correctable errors will accumulate, leading to reduced risks of uncorrectable errors. Data integrity is a high-priority concern in writing, reading, storage, transmission, or processing of data in computer operating systems and in computer storage and data transmission systems. However, only a few of the currently existing and used file systems provide sufficient protection against data corruption. To address this issue, data scrubbing provides routine checks of all inconsistencies in data and, in general, prevention of hardware or software failure. This "scrubbing" feature occurs commonly in memory, disk arrays, file systems, or FPGAs as a mechanism of error detection and correction. RAID ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unix
Unix (, ; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others. Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties in the late 1970s, leading to a variety of both academic and commercial Unix variants from vendors including University of California, Berkeley ( BSD), Microsoft (Xenix), Sun Microsystems ( SunOS/ Solaris), HP/ HPE ( HP-UX), and IBM ( AIX). The early versions of Unix—which are retrospectively referred to as " Research Unix"—ran on computers such as the PDP-11 and VAX; Unix was commonly used on minicomputers and mainframes from the 1970s onwards. It distinguished itself from its predecessors as the first portable operating system: almost the entire operating system is written in the C programming language (in 1973), which allows U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journaling File System
A journaling file system is a file system that keeps track of changes not yet committed to the file system's main part by recording the goal of such changes in a data structure known as a " journal", which is usually a circular log. In the event of a system crash or power failure, such file systems can be brought back online more quickly with a lower likelihood of becoming corrupted. Depending on the actual implementation, a journaling file system may only keep track of stored metadata, resulting in improved performance at the expense of increased possibility for data corruption. Alternatively, a journaling file system may track both stored data and related metadata, while some implementations allow selectable behavior in this regard. History In 1990 IBM introduced JFS in AIX 3.1 as one of the first UNIX commercial filesystems that implemented journaling. The next year the idea was popularized in a widely cited paper on log-structured file systems. This was subsequentl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CHKDSK
In computing, CHKDSK (short for "check disk") is a system software, system tool and command (computing), command in DOS and Microsoft Windows (and related operating systems), as well as Digital Research FlexOS, IBM/Toshiba 4690 Operating System, 4690 OS, IBM OS/2. It verifies the data integrity, integrity of the file system on a Volume (computing), volume (usually a partition (computing), partition) and attempts to fix logical file system errors. Logical errors are typically defined as software-level problems with a filesystem (or its metadata) as a result of prior software malfunction (e.g. crashes) or irregular use (e.g. hard resets). Logical errors are contrasted with and usually less severe than computer hardware, hardware-level errors, which can not be fixed with CHKDSK and may instead require data recovery software or expert assistance. CHKDSK is similar to the fsck command in Unix and similar to Microsoft ScanDisk, which co-existed with CHKDSK in Windows 9x and MS-DOS 6.x. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Btrfs
Btrfs (pronounced as "better F S", "butter F S", "b-tree F S", or "B.T.R.F.S.") is a computer storage format that combines a file system based on the copy-on-write (COW) principle with a logical volume manager (distinct from Linux's LVM), developed together. It was created by Chris Mason in 2007 for use in Linux, and since November 2013, the file system's on-disk format has been declared stable in the Linux kernel. Btrfs is intended to address the lack of pooling, snapshots, integrity checking, data scrubbing, and integral multi-device spanning in Linux file systems. Mason, the principal Btrfs author, stated that its goal was "to let inuxscale for the storage that will be available. Scaling is not just about addressing the storage but also means being able to administer and to manage it with a clean interface that lets people see what's being used and makes it more reliable". History The core data structure of Btrfsthe copy-on-write B-treewas originally proposed by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Jargon File
The Jargon File is a glossary and usage dictionary of slang used by computer programmers. The original Jargon File was a collection of terms from technical cultures such as the MIT AI Lab, the Stanford AI Lab (SAIL) and others of the old ARPANET AI/LISP/PDP-10 communities, including Bolt, Beranek and Newman (BBN), Carnegie Mellon University, and Worcester Polytechnic Institute. It was published in paperback form in 1983 as ''The Hacker's Dictionary'' (edited by Guy Steele) and revised in 1991 as ''The New Hacker's Dictionary'' (ed. Eric S. Raymond; third edition published 1996). The concept of the file began with the Tech Model Railroad Club (TMRC) that came out of early TX-0 and PDP-1 hackers in the 1950s, where the term ''hacker'' emerged and the ethic, philosophies and some of the nomenclature emerged. 1975 to 1983 The Jargon File (referred to here as "Jargon-1" or "the File") was made by Raphael Finkel at Stanford in 1975. From that time until the plug was finally pul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bastard Operator From Hell
The Bastard Operator From Hell (BOFH) is a fictional rogue computer operator created by Simon Travaglia, who takes out his anger on users (who are " lusers" to him) and others who pester him with their computer problems, uses his expertise against his enemies and manipulates his employer. Several people have written stories about BOFHs, but only those by Simon Travaglia are considered canonical. The BOFH stories were originally posted in 1992 to Usenet by Travaglia, with some being reprinted in ''Datamation.'' Since 2000 they have been published regularly in ''The Register'' (UK). Several collections of the stories have been published as books. By extension, the term is also used to refer to any system administrator who displays the qualities of the original. The early accounts of the BOFH took place in a university; later the scenes were set in an office workplace. In 2000 (BOFH 2k), the BOFH and his pimply-faced youth (PFY) assistant moved to a new company. Other charact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Decency Act
The Communications Decency Act of 1996 (CDA) was the United States Congress's first notable attempt to regulate pornographic material on the Internet. In the 1997 landmark case '' Reno v. ACLU'', the United States Supreme Court unanimously struck the act's anti-indecency provisions. The Act is the short name of Title V of the Telecommunications Act of 1996, as specified in Section 501 of the 1996 Act. Senators James Exon and Slade Gorton introduced it to the Senate Committee of Commerce, Science, and Transportation in 1995. The amendment that became the CDA was added to the Telecommunications Act in the Senate by an 81–18 vote on June 15, 1995. As eventually passed by Congress, Title V affected the Internet (and online communications) in two significant ways. First, it attempted to regulate both indecency (when available to children) and obscenity in cyberspace. Second, Section 230 of title 47 of the U.S. Code, part of a codification of the Communications Act of 1934 (S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minced Oath
A minced oath is a euphemistic expression formed by deliberately misspelling, mispronouncing, or replacing a part of a profane, blasphemous, or taboo word or phrase to reduce the original term's objectionable characteristics. An example is "gosh" for "God", or ''fudge'' for ''fuck''. Many languages have such expressions. In the English language, nearly all profanities have minced variants.Hughes, 12. Formation Common methods of forming a minced oath are rhyme and alliteration. Thus the word '' bloody'' can become '' blooming'', or '' ruddy''. Alliterative minced oaths such as ''darn'' for ''damn'' allow a speaker to begin to say the prohibited word and then change to a more acceptable expression.Hughes, 7. In rhyming slang, rhyming euphemisms are often truncated so that the rhyme is eliminated; ''prick'' became '' Hampton Wick'' and then simply ''Hampton''. Another well-known example is "cunt" rhyming with " Berkeley Hunt", which was subsequently abbreviated to "berk". Alliterat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
