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Environment variable information


An environment variable is a user-definable value that can affect the way running processes will behave on a computer. Environment variables are part of the environment in which a process runs. For example, a running process can query the value of the TEMP environment variable to discover a suitable location to store temporary files, or the HOME or USERPROFILE variable to find the directory structure owned by the user running the process.

They were introduced in their modern form in 1979 with Version 7 Unix, so are included in all Unix operating system flavors and variants from that point onward including Linux and macOS. From PC DOS 2.0 in 1982, all succeeding Microsoft operating systems, including Microsoft Windows, and OS/2 also have included them as a feature, although with somewhat different syntax, usage and standard variable names.

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Environment variable

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An environment variable is a user-definable value that can affect the way running processes will behave on a computer. Environment variables are part...

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Environment

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scientific journal Environment (type theory), the association between variable names and data types in type theory Deployment environment, in software deployment...

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Global variable

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all global variables is known as the global environment or global state. In compiled languages, global variables are generally static variables, whose extent...

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Batch file

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can be used similar to environment variables, but are not stored in the environment. Microsoft and IBM refer to these variables as replacement parameters...

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Classpath

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The parameter may be set either on the command-line, or through an environment variable. Similar to the classic dynamic loading behavior, when executing...

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Env

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a list of environment variables or run another utility in an altered environment without having to modify the currently existing environment. Using env...

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Dependent and independent variables

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A variable is considered dependent if it depends on an independent variable. Dependent variables are studied under the supposition or demand that they...

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COMSPEC

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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...

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Comparison of command shells

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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...

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Common Gateway Interface

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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...

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Snake case

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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...

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Termcap

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library from files or environment variables. The TERM environment variable contains the terminal type name. The TERMCAP environment variable may contain a termcap...

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OpenMP

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consists of a set of compiler directives, library routines, and environment variables that influence run-time behavior. OpenMP is managed by the nonprofit...

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Rpath

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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...

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GNU Core Utilities

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regular arguments (unless the POSIXLY_CORRECT environment variable is set). This environment variable enables a different functionality in BSD. See the...

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Daylight saving time

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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...

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Distcc

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compiling if it is not already cached by using the CCACHE_PREFIX environment variable. icecream was created by SUSE based on distcc. Like distcc, icecream...

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TMPDIR

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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...

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LMHOSTS

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sample file (lmhosts.sam) is installed here. Note that %windir% is an environment variable pointing to the Windows installation directory, usually C:\Windows...

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CFLAGS

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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...

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Deployment environment

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and Production are known and documented environment variables in ASP.NET Core. Depending on the defined variable, different code is executed and content...

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