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User-definable variable associated with each running process in many operating systems
An environment variable is a user-definable value that can affect the way running processes will behave on a computer. Environment variables are part
Environment_variable
Computer environment variable
PATH is an environment variable on Unix-like operating systems, DOS, OS/2, and Microsoft Windows, specifying a set of directories where executable programs
PATH_(variable)
Topics referred to by the same term
scientific journal Environment (type theory), the association between variable names and data types in type theory Deployment environment, in software deployment
Environment
syntax for file matching. Variable completion is the completion of the name of a variable name (environment variable or shell variable). Bash, zsh, and fish
Comparison_of_command_shells
Windows environment variable containing the directory path to the command shell
COMSPEC or ComSpec is one of the environment variables used in DOS, OS/2 and Windows, which normally points to the command-line interpreter, which is
COMSPEC
Means of entering commands to software
pseudo-environment variable named %/% to allow portable batch jobs to be written. Several external DR-DOS commands additionally support an environment variable
Command-line_interface
GNU replacement for the Bourne shell
separated by spaces. Environment variables are signified by all capital letters. Environment variables include UNIX variables like LESS_SIGUSR1, and
Bash_(Unix_shell)
Software to modify a shell environment during a session
between sets of environment variable settings, often used to configure different software packages, compilers, and libraries. Environment Modules allows
Environment Modules (software)
Environment_Modules_(software)
UNIX environment variable
TMPDIR is the canonical environment variable in Unix and POSIX that should be used to specify a temporary directory for scratch space. Most Unix programs
TMPDIR
Hard-coded search path
DT_RUNPATH attribute does not exist. The (colon-separated) paths in the environment variable LD_LIBRARY_PATH, unless the executable is a setuid/setgid binary
Rpath
Security bug in the GNU Bash shell discovered in 2014
concatenated to the end of function definitions stored in the values of environment variables. Within days of its publication, a variety of related vulnerabilities
Shellshock_(software_bug)
Interface between Web servers and external programs
defines CGI using C, in saying that environment variables "are accessed by the C library routine getenv() or variable environ". The name CGI comes from
Common_Gateway_Interface
Shell command for reporting and running with modified environment variables
command that either reports environment variables or runs a command in a subprocess with modified environment variables. The command is provided in a
Env
Script file for Microsoft computer operating systems
this topic. The PATHEXT environment variable can change the aforesaid default. COMMAND.COM and cmd.exe support special variables (%0, %1 through %9) in
Batch_file
Default macOS terminal emulator
(Mountain Lion) and later offers choices for values of the TERM environment variable. Available options are ansi, dtterm, nsterm, rxvt, vt52, vt100, vt102
Terminal_(macOS)
Default command line for MS-DOS and Windows 9x
files for COMMAND.COM can have four kinds of variables: Environment variables: These have the %VARIABLE% form and are associated with values with the
COMMAND.COM
Collection of standard, Unix-based utilities from GNU
generally provide POSIX compliant interface when the POSIXLY_CORRECT environment variable is set, but otherwise offers a superset to the standard interface
GNU_Core_Utilities
User-friendly interactive Unix shell
for expanding file paths (with wildcards and brace expansion), environment variables, and command-specific completions. Command-specific completions
Fish_(Unix_shell)
The parameter may be set either on the command-line, or through an environment variable. Similar to the classic dynamic loading behavior, when executing
Classpath
Computer terminal application programming interface
by the TERM environment variable (and, optionally for the termcap and terminfo libraries, the TERMCAP and TERMINFO environment variables, respectively)
POSIX_terminal_interface
command can also be influenced by a shell's environment variables. For example, an environment variable can be set to control the number of commands
History_(command)
Software library and database
library from files or environment variables. The TERM environment variable contains the terminal type name. The TERMCAP environment variable may contain a termcap
Termcap
Type of computer program
HOME environment variable to store settings (e.g. $HOME/.w3m for the w3m browser). The dynamic linker provides an environment variable LD_LIBRARY_PATH
Portable_application
Topics referred to by the same term
abbreviation for Slashdot, a nerd-focused social news website %/%, an environment variable in DOS /a/ (disambiguation) /b/ (disambiguation) /e/ (operating system)
/_(disambiguation)
Shell for Windows NT and other operating systems
includes entered text, individual environment variables that are inherited by other processes, and all environment variable expansions On Windows XP and later
Command_Prompt_(Windows)
Function that loads and executes a new child process
null-terminated string defining an environment variable. An environment variable has the form: name=value where name is the variable name and value is its value
Spawn_(computing)
Words joined with underscores
programming languages like C/C++, Python, Java, PHP, as well as for environment variables. The use of underscores as word separators dates back to the late
Snake_case
Integer number that is made available to the parent of a terminated process
through IF ERRORLEVEL commands. Multiuser DOS supports a reserved environment variable %ERRORLVL% which gets automatically updated on return from applications
Exit_status
Process in computer science
must be the same, regardless of the build environment used. This typically involves normalizing variables that may change, such as order of input files
Reproducible_builds
Software documentation on Unix systems
man-page viewer, rather than only being readable in printed form. The environment variable MANPATH often specifies a list of directory paths to search for the
Man_page
Default directory for file-system operations
some shells provide a variable that contains the working-directory path. Typically, a Unix-like shell provides an environment variable named PWD. Windows
Working_directory
Unix access rights flag
libc was at one point vulnerable to an exploit using setuid and an environment variable that allowed executing code from untrusted shared libraries. The
Setuid
Execute a file (a library function and/or a system call)
where no environment variables can be passed (execl(), execlp(), execv(), execvp()), the new process image inherits the current environment variables. The
Exec_(system_call)
Concept in mathematical modeling, statistical modeling and experimental sciences
A variable is considered dependent if it depends on (or is hypothesized to depend on) an independent variable. Dependent variables are the outcome of the
Dependent and independent variables
Dependent_and_independent_variables
Computer file system
the SHOWVERSIONS environment variable is set), but versions are otherwise accessible for all normal operations. The environment variable and general accessibility
Versioning_file_system
Functions of the C standard software library
if (!path) { fprintf(stderr, "PATH environment variable not found.\n"); } else { printf("PATH variable: %s\n", path); } printf("Listing current directory
C_process_control
GNU internationalization and localization software
on GNU variants can also use the environment variable LANGUAGE instead. Its main difference from the Unix variable is that it supports multiple languages
Gettext
application is a utility for accessing the .Xauthority file. The environment variable XAUTHORITY can be defined to override the name and location of that
X_Window_System_authorization
Seasonal change of clock settings
part of ordinary system maintenance. In Unix-like systems the TZ environment variable specifies the location name, as in TZ=':America/New_York'. In many
Daylight_saving_time
Computer programming, a variable accessible throughout a computer program
all global variables is known as the global environment or global state. In compiled languages, global variables are generally static variables, whose extent
Global_variable
Open standard for parallelizing
consists of a set of compiler directives, library routines, and environment variables that influence run-time behavior. OpenMP is managed by the nonprofit
OpenMP
System in which software component is executed
and Production are known and documented environment variables in ASP.NET Core. Depending on the defined variable, different code is executed and content
Deployment_environment
Text that identifies an item in a computer file system
Win9x), were limited to 260 characters, or less, as defined by the environment variable MAX_PATH. For backwards compatibility with legacy applications this
Path_(computing)
Directory for storing temporary data in a computer file system
AmigaDOS T: are used. Temporary file Temporary variable Trash (computing) "Recognized Environment Variables". Microsoft. Retrieved 13 March 2022. "GetTempPath2A
Temporary_folder
Aspect of gene expression
particular phenotypic trait and environment variable. For every genotype, phenotypic trait, and environmental variable, a different reaction norm can exist;
Reaction_norm
scott/tiger@connection_string ) via environment variables ($TWO_TASK in Unix-like environments; %TWO_TASK% in Microsoft Windows environments) in local configuration
Connection_string
specified with the -e option; otherwise it is read from the FCEDIT environment variable, or, in some shells, EDITOR, with a fallback to vi or ed. Command-line
Fc_(Unix)
Compiler option for C and C++ software development
CFLAGS and CXXFLAGS are either the name of environment variables or of Makefile variables that can be set to specify additional switches to be passed to
CFLAGS
File is used to enable Domain Name Resolution under Windows
sample file (lmhosts.sam) is installed here. Note that %windir% is an environment variable pointing to the Windows installation directory, usually C:\Windows
LMHOSTS
Named container for a particular type of data
In some high-level programming languages, a variable is an abstract storage or indirection location paired with an associated symbolic name, which contains
Variable (high-level programming language)
Variable_(high-level_programming_language)
Terminal pager available on various operating systems
(added underlining, single spacing) and John Foderaro (added -c, more environment variable history). It was first included in 3.0 BSD, and has since become
More_(command)
Research distributed operating system
A path environment variable ($path) still exists in the rc shell (the shell mainly used in Plan 9); however, rc's path environment variable conventionally
Plan_9_from_Bell_Labs
Method used for display options on video text terminals
the S-Lang library (version 0.99-32, June 1996) used a separate environment variable $COLORTERM to indicate whether a terminal emulator could use colors
ANSI_escape_code
Multimedia playlist file format
Windows File4=%UserProfile%\Music\short.ogg Title4=example for an Environment variable Length4=5 NumberOfEntries=4 Version=2 Unix/BSD/Linux/OS X In Unix-like
PLS_(file_format)
Java Runtime Environment element which loads Java .class files
loads code found on java.class.path, which maps to the CLASSPATH environment variable. The Java class loader is written in Java. It is therefore possible
Java_class_loader
Family of IEEE standards for compatibility between operating systems
blocks. The environment variable POSIX_ME_HARDER was introduced to allow the user to force the standards-compliant behaviour. The variable name was later
POSIX
Technique for creating lexically scoped first class functions
function together with an environment. The environment is a mapping associating each free variable of the function (variables that are used locally, but
Closure (computer programming)
Closure_(computer_programming)
Operating system feature that integrates dynamic libraries into a program at runtime
DYLD_FRAMEWORK_PATH and DYLD_PRINT_LIBRARIES environment variables. The former of the previously mentioned variables adjusts the executables' search path for
Dynamic_linker
securely using your favorite editor set to the $VISUAL or $EDITOR environment variable, instead of accessing them directly from the CLI editor like GNU
Vipw
Linker for ELF files
minor ways. To specify gold in a makefile, one sets the LD or LD environment variable to ld.gold. To specify gold through a compiler option, one can use
Gold_(linker)
Parameters defining locale in computer
LC_NUMERIC, LC_TIME - cppreference.com". en.cppreference.com. "Environment Variables". pubs.opengroup.org. "Locale Names (The GNU C Library)". sourceware
Locale_(computer_software)
Text processing programming language
published. The subscript of ENVIRON is the name of an environment variable; its result is the variable's value. This is like the getenv function in various
AWK
memory allocations and frees to a file defined by the environment variable MALLOC_TRACE (if the variable is unset, describes an invalid filename, or describes
Mtrace
Free URL data transfer client software
directory C:\Windows directory Directories specified in the PATH environment variable curl will return an error message if the remote server is using a
CURL
Graphics card driver for Linux
allows these GPU to support shaders-based ray tracing by using an environment variable, same as more recent hardware revisions. Radeon — AMD's main GPU
AMDgpu_(Linux_kernel_module)
32-bit versions of Windows. Anyway, the command relied on %DPATH% environment variable, which can be edited with the dpath command. In the modern Windows
Dpath
Windows browser cache folder
%USERPROFILE%\Local Settings\Temporary Internet Files where %USERPROFILE% is an environment variable pointing to the root directory of the logged-in user's user profile)
Temporary_Internet_Files
Specifies initial commands run under DOS-type operating systems
x as used in Windows 95 and Windows 98. Windows Me only parses environment variables as part of its attempts to reduce legacy dependencies, but this
AUTOEXEC.BAT
Topics referred to by the same term
theory) Graph bandwidth Width of a hypergraph %$WIDTH%, a computer environment variable in DOS Plus Per Ove Width (born 1939), Norwegian politician "The
Width_(disambiguation)
Standard directory in Microsoft Windows
have a %ProgramFiles(x86)% environment variable, the dirids and CSIDLs are not different between 32-bit and 64-bit environments; the APIs merely return different
Program_Files
Open-source container software
selector. Kubernetes provides two modes of service discovery, using environment variables or using Kubernetes DNS. Service discovery assigns a stable IP address
Kubernetes
Features of a computer terminal beyond displaying text
uses the terminal type specified by the TERM environment variable, one of the controlling environment variables of the POSIX terminal interface. This can
Terminal_capabilities
Networking protocol for clock synchronization
for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the
Network_Time_Protocol
Shell command for calculating a checksum
systems, the cksum command returns a different CRC value, unless the environment variable CMD_ENV is set to xpg4.[citation needed] The command uses the generator
Cksum
Software library used via dynamic linking
working directory; and finally the directories specified by the PATH environment variable. Applications written for the .NET Framework (since 2002), also check
Dynamic_library
Testing environment for software development
programs or other code under development (e.g. usage of the same environment variables as, or access to an identical database to that used by, the stable
Sandbox (software development)
Sandbox_(software_development)
Windows built-in system profiler
(CD-ROM, sound, network, etc.), and the Windows environment as well (drivers, environment variables, services, etc.). It can export this information
System_Information_(Windows)
Website offering Windows apps packaged for portability
used to make applications portable by handling path redirection, environment variable changes, file and directory movement, configuration file path updates
PortableApps.com
modes only in limited forms, such as for current directory and environment variables. Most modern operating systems provide both a GUI and some level
Graphical_user_interface
Computer system that provides behavior needed by running code
execution. For example, environment variables are features of many operating systems, and are part of the runtime environment; a running program can access
Runtime_system
an environment variable for the user's name. When the user accesses a part of the site that requires authentication, the presence of that variable allows
CoSign_single_sign_on
Microsoft Windows user interface concept
In the former case, they are analogous to environment variables—in fact, many of the environment variables that are set in a user's session are defined
Special_folder
Interpreted server-side scripting language
and may also be the text output from a program, or the value of a system variable such as the current time. The following are SSI directives from the times
Server_Side_Includes
Command of command line interpreters
Windows Terminal. The default window title is defined in the %COMSPEC% environment variable. However, since the Windows Console title can also be defined in
Title_(command)
Program used for Secure Shell connections
confirmation from the user using the program specified by the SSH_ASKPASS environment variable, whenever ssh tries to connect. Ssh-agents can be "forwarded" onto
Ssh-agent
Computer input/output device for users
systems the termcap or terminfo files, the stty utility, and the TERM environment variable would be used; in Data General's Business BASIC software, for example
Computer_terminal
Open-source system utility
unknown exploits. authbind achieves this by defining the LD_PRELOAD environment variable which loads a libauthbind library. This library overrides the bind()
Authbind
2021 software security vulnerability
is disabled, an attacker can still retrieve data—such as secret environment variables—by placing them in the URL, in which case they will be substituted
Log4Shell
Models the mean time to failure of a semiconductor circuit due to electromigration
operating life (HTOL), electrical, and any other relevant operating environment variables. Black, J.R. (1969). "Electromigration—A brief survey and some recent
Black's_equation
American cloud application company
employee's Google Workspace account, accessing "some Vercel environments and environment variables that were not marked as 'sensitive'". A threat actor claiming
Vercel
Discontinued operating system
environment variables in symbolic links, which, for example, allows switching between different versions of Unix by setting the SYSTYPE environment variable
Domain/OS
Topics referred to by the same term
United States S-Lang, a programming language created in 1992 LANG, environment variable in POSIX standard that sets multiple locale parameters The LANG attribute
Lang
ports, ROM emulators, JTAG, etc. Just like in other boot loaders environment, variables are commonly configured in persistent storage to create auto boot
Common_Firmware_Environment
Data structure in DOS
pointer to the environment segment is neither 0000h nor FFFFh, programs should first try to retrieve the command line from the environment variable %CMDLINE%
Program_Segment_Prefix
Retired Microsoft remote installation facility
allows PXE BIOS-enabled computers to remotely execute boot environment variables. These variables are likely computers that are on a company's (or that company's
Remote_Installation_Services
Concept in statistics
observable variables are used to infer quality of life. Observable variables to measure quality of life include wealth, employment, environment, physical
Latent and observable variables
Latent_and_observable_variables
Calling convention for web servers
application objects based on the target URL, after changing the environment variables accordingly. Allowing multiple applications or frameworks to run
Web_Server_Gateway_Interface
Cross-platform shell based on .NET technology
session reconnections. -PipelineVariable switch: A new ubiquitous parameter to expose the current pipeline object as a variable for programming purposes Network
PowerShell
2000 Microsoft operating system version
only to set global environment variables. The two files (if present) are scanned for settings relating to the environment variables, and any other commands
Windows_Me
Unix shell
are the precursors of the environment variables found in all Unix systems from Version 7 onward. For example, The $s variable is the ancestor of $HOME
PWB_shell
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