Environment variable

Environment variables are a set of dynamic named values that can affect the way running processes will behave on a computer.

They 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 OS X. 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.

Details

In all Unix and Unix-like systems, each process has its own separate set of environment variables. By default, when a process is created, it inherits a duplicate environment of its parent process, except for explicit changes made by the parent when it creates the child. At the API level, these changes must be done between running fork and exec. Alternatively, from command shells such as bash, a user can change environment variables for a particular command invocation by indirectly invoking it via env or using the ENVIRONMENT_VARIABLE=VALUE <command> notation. All Unix operating system flavors, DOS, and Windows have environment variables; however, they do not all use the same variable names. A running program can access the values of environment variables for configuration purposes.

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CONFIG.SYS

CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems. It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system during boot. CONFIG.SYS was introduced with DOS 2.0.

Usage

The directives in this file configure DOS for use with devices and applications in the system. The CONFIG.SYS directives also set up the memory managers in the system. After processing the CONFIG.SYS file, DOS proceeds to load and execute the command shell specified in the SHELL line of CONFIG.SYS, or COMMAND.COM if there is no such line. The command shell in turn is responsible for processing the AUTOEXEC.BAT file.

CONFIG.SYS is composed mostly of name=value directives which look like variable assignments. In fact, these will either define some tunable parameters often resulting in reservation of memory, or load files, mostly device drivers and TSRs, into memory.

In DOS, CONFIG.SYS is located in the root directory of the drive from which the system was booted.

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location on Google Map

Fort McMurray (South Liege) Aerodrome

Fort McMurray (South Liege) Aerodrome, (TC LID: CLS3), is located northwest of Fort McMurray, Alberta, Canada.

References

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Fort_McMurray_(South_Liege)_Aerodrome

Celebration

Celebration or Celebrations may refer to:

Party, a social gathering or celebration

Festival, a community gathering to celebrate something in particular

The observance of a feast day or holiday

The celebration of the Eucharist

Celebration (Alaska festival)

Art

Celebration (Tyeb Mehta), a painting by Tyeb Mehta

Botany

Celebration, a barley variety

Geography

Celebration, Florida, a community in the United States, originally developed by The Walt Disney Company

Brands

Celebrations (confectionery), a chocolate collection made by Mars, Inc

Celebrations, brand of Celebrations Group, UK greetings card manufacturer

Film, TV and theatre

Celebration (play), by Harold Pinter

Celebration (TV series), a Canadian music television series

Star Wars Celebration, an official Star Wars convention

The Celebration, a 1998 Danish film

Ships

Celebration (ship), a Holiday Class cruise ship operated by Carnival Cruise Lines

Music

Celebration (musical), a 1969 avante-garde musical theater work by Harvey Schmidt and Tom Jones

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Celebration (Eric Kloss album)

Celebration is an album by saxophonist Eric Kloss recorded in 1979 and released on the Muse label.

Reception

The AllMusic review stated: "The playing is on a high level and the compositions are complex, but the overall music (other than the opening "Celebration") tends to be a bit dull".