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Family of IEEE standards for compatibility between operating systems
The Portable Operating System Interface (POSIX; IPA: /ˈpɒz.ɪks/) is a family of standards specified by the IEEE Computer Society for maintaining compatibility
POSIX
Sequence of characters that forms a search pattern
writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax. Regular expressions
Regular_expression
Date and time representation system widely used in computing
the next day). For example, this is what happened on strictly conforming POSIX.1 systems at the end of 1998: Unix time numbers are repeated in the second
Unix_time
GNU replacement for the Bourne shell
-p POSIXLY_CORRECT SHLVL bash: declare: POSIXLY_CORRECT: not found declare -x SHLVL="1" $ sh $ declare -p POSIXLY_CORRECT SHLVL declare -- POSIXLY_CORRECT="y"
Bash_(Unix_shell)
Subsystem shipped with the first versions of Windows NT
Microsoft POSIX subsystem is one of four subsystems shipped with the first versions of Windows NT, the other three being the Win32 subsystem which provided
Microsoft_POSIX_subsystem
of the most recent version of the Portable Operating System Interface (POSIX) – IEEE Std 1003.1-2024 which is part of the Single UNIX Specification (SUS)
List_of_POSIX_commands
C language standard library specifically for POSIX systems
The C POSIX library is a specification of a C standard library for POSIX systems. It was developed at the same time as the ANSI C standard. Some effort
C_POSIX_library
File format and file archiver program
in POSIX.1-1988 and later POSIX.1-2001, and became a format supported by most modern file archiving utilities. The tar command was abandoned in POSIX.1-2001
Tar_(computing)
Technology for controlling access to file system items
one codified by POSIX. Since POSIX defines both the older Unix-based technology as well as ACLs, the former is called traditional POSIX permissions for
File-system_permissions
Command-line interpreter for Unix operating system
since bash 4.2, also if invoked explicitly in POSIX compatibility mode (with options --posix or -o posix). Only in sh/ksh compatibility mode (when invoked
Unix_shell
Form of inter-process communication in computer systems
inter-process communication (IPC), typically used in Unix, Unix-like, and other POSIX-compliant operating systems. A signal is an asynchronous notification sent
Signal_(IPC)
Execution model which allows for parallel computing
In computing, POSIX Threads, commonly known as pthreads (after its header <pthread.h>), is an execution model that exists independently from a programming
Pthreads
Operating system that behaves similarly to Unix
from the POSIX chair Andrew Josey for the symbolic price of one dollar.[citation needed] There have been some activities to make Linux POSIX-compliant
Unix-like
Unix-like environment for Windows
rewrite the tools to use the Win32 runtime environment, Cygwin implemented a POSIX-compatible environment in the form of a DLL. The brand motto is "Get that
Cygwin
The Native POSIX Thread Library (NPTL) is an implementation of the POSIX Threads specification for the Linux operating system. Before the 2.6 version
Native_POSIX_Thread_Library
List of permissions for a system resource
permissions. POSIX 1003.1e/1003.2c working group made an effort to standardize ACLs, resulting in what is now known as "POSIX.1e ACL" or simply "POSIX ACL".
Access-control_list
Inter-process communication API
modification from a de facto standard into a component of the POSIX specification. The term POSIX sockets is essentially synonymous with Berkeley sockets,
Berkeley_sockets
Computer terminal application programming interface
The POSIX terminal interface is the generalized abstraction, comprising both an application programming interface for programs, and a set of behavioural
POSIX_terminal_interface
Standard library for the C programming language
the original ANSI C standard, it was developed at the same time as the C POSIX library, which is a superset of it. Since ANSI C was adopted by the International
C_standard_library
Communications endpoint for exchanging data between processes
messages in the order sent The UDS facility is a standard component of a POSIX operating system. The API for a UDS is similar to that of an Internet socket
Unix_domain_socket
Method to access file data on a computer
In modern POSIX compliant operating systems, a program that needs to access data from a file stored in a file system uses the read system call. The file
Read_(system_call)
Family of Unix-like operating systems
a digital copy of the POSIX standards documentation with a request to the comp.os.minix newsgroup. After not finding the POSIX documentation, Torvalds
Linux
Patterns used in computer programming
glob() (/ɡlɒb/) is a POSIX C function for globbing, which is the archetypal use of pattern matching against the names in a filesystem directory such that
Glob_(programming)
Standards for operating systems for using the UNIX trademark
Specification, although system developers generally aim for compliance with POSIX standards, which form the core of the Single UNIX Specification. The latest
Single_UNIX_Specification
Compiler toolchain for Windows
runtime. Because MinGW does not provide a full POSIX environment, applications that rely on strictly POSIX-compliant process management, such as fork()
MinGW
Computer safety concept
addressing EROS: a fast capability system POSIX "capabilities" in Linux: POSIX Capabilities & Files POSIX file capabilities: Parceling the power of root
Capability-based_security
Script written for an operating system shell
particular name for these functions. All Unix-like systems include at least one POSIX shell, typically either bash or the zsh compatibility mode. Comments are
Shell_script
File archiver and associated file format
meta information to an ASCII-based representation. cpio was removed from POSIX.1-2001 in favor of pax, a similar utility which had been introduced in the
Cpio
Integer number that is made available to the parent of a terminated process
POSIX-compatible systems, the parent process can retrieve the exit status of a child process using the wait() family of system calls defined in POSIX
Exit_status
ISO standard for locale in computing
cultural elements) is an ISO/IEC standard for the registration of new POSIX locales and POSIX charmaps. This standard is the result of a "fast-track" adoption
ISO/IEC_15897
Connection between computers or programs
the operating system. POSIX, for example, specifies a set of common APIs that aim to enable an application written for a POSIX conformant operating system
API
Linux kernel APIs and ABIs
defined in POSIX in a way which is reasonably compatible, robust and performant, and to provide additional useful features not defined in POSIX, just as
Linux_kernel_interfaces
File types in Unix-based operating systems
FIFO special, block special, character special, and socket as defined by POSIX. These types are used in the file system(s) of a Unix or Unix-like operating
Unix_file_types
Unix signal
On POSIX-compliant platforms, SIGHUP ("signal hang up") is a signal sent to a process when its controlling terminal is closed. It was originally designed
SIGHUP
Arbitrary-precision calculator supporting interactive and scripted use
||= << >> <<= >>= ?: are not available in POSIX bc. The sqrt() function for calculating square roots is POSIX bc's only built-in mathematical function
Bc_(programming_language)
Symbol "#!", used in computing
make any additional arguments available to the script. If /bin/sh is a POSIX-compatible shell, then bar and baz are presented to the script as the positional
Shebang_(Unix)
Yes Yes POSIX Built-in Default for the Enlightenment desktop environment Hikari Floating C — — 2022 MIT wlroots libinput Until 2022 Yes Yes POSIX Separate
List_of_display_servers
Symbian software libraries
C++ application programming interfaces in standard C libraries such as POSIX libc – The "C Standard Library" with system APIs mapped to Symbian OS APIs
P.I.P.S.
Header file for C programs
definitions from POSIX and GNU makes it even less portable than the sys_errlist table. The GNU C library (GLIBC) provides the additional POSIX error values
Errno.h
GNU internationalization and localization software
Object Template), .PO (Portable Object) and .MO (Machine Object). Initially, POSIX provided no means of localizing messages. Two proposals were raised in the
Gettext
Type of denial-of-service software attack
Section 3.3". Retrieved December 11, 2022. When the shell is in POSIX mode (see Bash POSIX Mode), fname must be a valid shell name and may not be the same
Fork_bomb
Parameters defining locale in computer
besides a "minimal locale" name "C", although the POSIX format is a commonly used baseline. On POSIX platforms such as Unix, Linux and others, locale identifiers
Locale_(computer_software)
Operating system
emulating the environments of VM, MVS, and Portable Operating System Interface (POSIX). It is a predecessor of the Extremely Reliable Operating System (EROS)
KeyKOS
Free Unix-like operating system kernel
Linux implemented Unix-like system call semantics and exposed the standard POSIX APIs through an implementation of the C standard library, Linux could run
Linux_kernel
from a 3rd party copyrighted library called XAD that is available for all POSIX (Unix, Linux, BSD, and for AmigaOS, MorphOS, etc.). This library is freely
Comparison of operating systems
Comparison_of_operating_systems
General-purpose programming language
handed off to the IEEE working group 1003 to become the basis for the 1988 POSIX standard. In 1989, the C standard was ratified as ANSI X3.159-1989 "Programming
C_(programming_language)
Shell command for listing files
such as directories. Originally developed for Unix and later codified by POSIX and Single UNIX Specification, it is supported in many operating systems
Ls
Software specification for avionics
standards. Some ARINC 653 (APEX) calls have a POSIX equivalent, but are different from how they are defined in POSIX. For example, the following call defined
ARINC_653
Implementation of C standard library for Linux operating system
binary without significant size overhead. It claims compatibility with the POSIX 2008 specification and the C11 standard. It also implements most of the
Musl
Research distributed operating system
differently. Plan 9 can support POSIX applications and can emulate the Berkeley socket interface through the ANSI/POSIX Environment (APE) that implements
Plan_9_from_Bell_Labs
Software library for interpreting regular expressions
1997. PCRE's syntax is much more powerful and flexible than either of the POSIX regular expression flavors (BRE, ERE) and than that of many other regular-expression
Perl Compatible Regular Expressions
Perl_Compatible_Regular_Expressions
Shell command for calculating a checksum
provides additional checksum algorithms via -a option, as an extension beyond POSIX. The standard command, as found on most Unix and Unix-like operating systems
Cksum
History of Apple's current Mac operating system
now an Open Brand UNIX 03 Registered Product, conforming to the SUSv3 and POSIX 1003.1 specifications for the C API, Shell Utilities, and Threads. "Do Classic
MacOS_version_history
Family of computer operating systems
standardization effort now known as POSIX provided a common baseline for all operating systems; IEEE based POSIX around the common structure of the major
Unix
Structure of information stored on a computer
A file format is the way that information is encoded for storage in a computer file. It may describe the encoding at various levels of abstraction including
File_format
Unix/POSIX system account group number; numeric value used to represent a specific group
In Unix-like systems, multiple users can be put into groups. POSIX and conventional Unix file system permissions are organized into three classes, user
Group_identifier
Computer memory that can be accessed by multiple processes
systems. POSIX provides a standardized API for using shared memory, POSIX Shared Memory. This uses the function shm_open from sys/mman.h. POSIX interprocess
Shared_memory
POSIX-compatible programming environment for DOS and OS/2
allows creating and executing of 32-bit mode applications, presenting a POSIX API and, on OS/2, access to the OS/2 APIs. The EMX package consists of:
EMX_(programming_environment)
Java library
possible to load msvcrt for its partial POSIX support on Windows... Posix posix = (Posix) Native.loadLibrary("c", Posix.class); // but it will still fail on
Java_Native_Access
Lightweight Unix shell
additions". Fast, small, and virtually compatible[citation needed] with the POSIX standard's specification of the Unix shell, ash did not provide line editing
Almquist_shell
Shell command for copying and converting file data
2 of 1987[citation needed]. This is inherited by IEEE Std 1003.1-2008 (POSIX)[citation needed], which is part of the Single UNIX Specification. In 1990
Dd_(Unix)
Command-line interpreter for operating systems
historically BSD-based systems had many scripts written in csh. As the basis of POSIX sh syntax, Bourne shell scripts can typically be run with Bash or dash on
Bourne_shell
Computer operating system
NT OS/2 was intended to be a secure, multi-user operating system with POSIX compatibility and a modular, portable kernel with preemptive multitasking
Microsoft_Windows
Any file that contains a reference to another file or directory
to nothing. Symbolic links were introduced in 1982 in 4.1a BSD Unix. The POSIX standard defines the symbolic link as found in most Unix-like operating
Symbolic_link
Disk utility program
for remote shells. It runs on UNIX-based systems, such as Linux, BSD, and POSIX. Users can install ncdu by running a package manager command in their terminal
Ncdu
Basic memory management system calls used in Unix
be done using the mmap call. It is found in header <unistd.h>, in the C POSIX library. The brk and sbrk calls dynamically change the amount of space allocated
Sbrk
C library function for parsing command-line options
getopt() is a POSIX C function used to parse command-line options of the Unix/POSIX style on C. It is a part of the POSIX specification, and is universal
Getopt
Computer mechanism
calls on NFS files using POSIX byte-range locks. These locks will be visible to other NFS clients that implement fcntl-style POSIX locks, but invisible to
File_locking
GNU implementation of the standard C library
as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational
Glibc
Archiving utility for various operating systems
Usenix/IEEE POSIX replacement for TAR and CPIO. Manual pages for pax on HP-UX, IRIX, and SCO UNIX attribute pax to Colburn. As early as POSIX.2 draft 10
Pax_(command)
Execute a file (a library function and/or a system call)
programming languages usually provide one call named exec().[citation needed] The POSIX standard declares a family of exec functions in the unistd.h header file
Exec_(system_call)
Value identifying a user account in Unix and Unix-like operating systems
processes, tar archives, and the now-obsolete Network Information Service. In POSIX-compliant environments, the shell command id gives the current user's UID
User_identifier
Thread library
GNU Pth (Portable Threads) is a POSIX/ANSI-C based user space thread library for UNIX platforms that provides priority-based scheduling for multithreading
GNU_Portable_Threads
Shell command for comparing file content
was specifically designed to use a diff output report as a patch file. POSIX standardized the diff and patch commands including their shared file format
Diff
User-friendly interactive Unix shell
feature-rich by default, rather than highly configurable, and does not adhere to POSIX shell standards by design. fish displays incremental suggestions as the
Fish_(Unix_shell)
Unix shell builtin
function or alias with the same name. $ command ls List of POSIX commands "command - manned.org". POSIX Programmer's Manual. Retrieved 13 February 2025. "command(1p)"
Command_(Unix)
Computer operating system
Platypus. Darwin is mostly POSIX-compatible, but has never, by itself, been certified as compatible with any version of POSIX. Starting with Leopard, macOS
Darwin_(operating_system)
Shell command that reports the working directory
Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification. It appeared in Version 5 Unix. The
Pwd
Real-time operating system
"LynuxWorks"). Sometimes known as the Lynx Operating System, LynxOS features full POSIX conformance and, more recently, Linux compatibility.[citation needed] LynxOS
LynxOS
Cisco Packet Tracer Router Sim Cygwin: For Microsoft Windows, provides a POSIX environment and system libraries (contained in cygwin.dll). This does not
List_of_emulators
Free and open-source software portal cflow is a POSIX-defined shell command for generating a C-language flow graph. The GNU implementation reads C source
Cflow
Line-oriented text editor
improvement to ed, the original Unix editor. Today, it is standardized by POSIX. George Coulouris of Queen Mary College developed an improved version of
Ex_(text_editor)
Free software for dialog boxes
Zenity is a free software and cross-platform computer program that allows the execution of GTK dialog boxes in command-line and shell scripts. Like tools
Zenity
German software engineer
speeding up Linux development at the expense of breaking compatibility with POSIX and other Unix-like operating systems such as the BSDs. He took this position
Lennart_Poettering
system can be used for block based media and is configurable for Small POSIX, Full POSIX and can be ported to many RTOS environments. Tuxera has a certified
List_of_file_systems
Means of interprocess communication in software engineering
on March 17, 2012. Retrieved April 21, 2010. Linux and POSIX message queues. Overview of POSIX message queues Archived 2012-05-04 at the Wayback Machine
Message_queue
Remote desktop software client for POSIX-based operating systems
Remmina is a free and open source remote desktop client for POSIX-based computer operating systems. It supports the Remote Desktop Protocol (RDP), VNC
Remmina
Application container for Linux
Podman, and Lilipod and act as wrapper for them. Distrobox is written in POSIX shell. Software installed inside the container can be exported into the
Distrobox
C standard library for Android operating system
implement all of C11 and POSIX, there are still (as of Android 15) about 11 POSIX functions missing from libc. There are also POSIX functions such as the
Bionic_(software)
Command-line utility for text search
commonly deployed on POSIX systems, to the point the POSIX specification mentions their widespread existence, are actually not part of POSIX. Other commands
Grep
Unix shell
in its default configuration deviates in some significant ways from the POSIX standard specification of the sh language (such as eliminating implicit
Z_shell
Standard UNIX utility for parsing arguments sent from the command-line
arguments. It is designed to process command line arguments that follow the POSIX Utility Syntax Guidelines, based on the C interface of getopt. The predecessor
Getopts
Text editor for POSIX operating systems
ne (for "nice editor") is a console text editor for POSIX computer operating systems such as Linux or Mac OS X. It uses the terminfo library, but it can
Ne_(text_editor)
Intrusion prevention software framework
language, it is designed to prevent brute-force attacks. It is able to run on POSIX systems that have an interface to a packet-control system or firewall installed
Fail2ban
Shell command that copies file
Version 1 Unix, and is specified by POSIX. The implementation from GNU has many additional options beyond the POSIX specification. The command is bundled
Cp_(Unix)
Distributed data processing framework
the replication of data high. HDFS is not fully POSIX-compliant, because the requirements for a POSIX file-system differ from the target goals of a Hadoop
Apache_Hadoop
Shell command for formatting and outputting text; like printf() library function
Guide since issue 4 of 1992. It was inherited into the first version of POSIX.1 and the Single Unix Specification. It first appeared in 4.3BSD-Reno. The
Printf_(Unix)
Episode is a POSIX compliant file system most commonly known for its use in DCE/DFS file servers. It was designed to achieve the goals of portability
Episode_filesystem
Real-time operating system (RTOS) software
(SMP) capable, and to support all current POSIX application programming interfaces (APIs) and any new POSIX APIs that could be anticipated while still
QNX
implementation of POSIX Threads introduced in 1996. The main developer of LinuxThreads was Xavier Leroy. It has been superseded by the Native POSIX Thread Library
LinuxThreads
POSIX
POSIX
POSIX
POSIX
Girl/Female
Danish, German, Swedish
Christian Woman
Boy/Male
Hindu, Indian
The Lord of Night
Surname or Lastname
English
English : local name for someone who lived in a small cottage or temporary dwelling, Middle English logge (Old French loge, of Germanic origin). The term was used in particular of a cabin erected by masons working on the site of a particular construction project, such as a church or cathedral, and so it was probably in many cases equivalent to an occupational name for a mason. Reaney suggests that one early form, atte Logge, might sometimes have denoted the warden of a masons’ lodge.Henry Cabot Lodge (1850–1924), the influential U.S. senator from MA, was born in Boston, the only son of John Ellerton Lodge, a prosperous merchant and owner of swift clipper ships engaged in commerce with China, one of several Lodges who emigrated from England in the 18th and 19th centuries.
Female
Serbian
(СофиÑ) Croatian and Serbian form of Greek Sophia, SOFIJA means "wisdom."
Girl/Female
Tamil
Himaadri | ஹிமாதà¯à®°à¯€
Snow mountain, The himalayas
Girl/Female
Arabic, Muslim
Perfect; Complete
Female
Egyptian
, the granddaughter of Tetet.
Boy/Male
Bengali, English, Indian, Sindhi
Key
Girl/Female
Muslim/Islamic
Merciful companionate, kind
Boy/Male
Hindu
Lord Shiva
POSIX
POSIX
POSIX
POSIX
POSIX