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In computing, configuration files (or config files) are files used to configure the parameters and initial settings for some computer programs. They are used for user applications, server processes and O Belt Pleated with Solid Neck Blue Dress Casual Women New Navy 6qEwF8a1n settings.
Some applications provide tools to create, modify, and verify the syntax of their configuration files; these sometimes have graphical interfaces. For other programs, system administrators may be expected to create and modify files by hand using a text editor; possible because many are human-editable plain texts. For server processes and operating-system settings, there is often no standard tool, but operating systems may provide their own graphical interfaces such as YaST or debconf.
Some computer programs only read their configuration files at startup. Others periodically check the configuration files for changes. Users can instruct some programs to re-read the configuration files and apply the changes to the current process, or indeed to read arbitrary files as a configuration file. There are no definitive standards or strong conventions.
Across Unix-like operating systems many different configuration-file formats exist, with each application or service potentially having a unique format, but there is a strong tradition of them being in human-editable plain text, and a simple key-value pair format is common. Filename extensions of
.cf or as well
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Almost all formats allow comments, in which case, individual settings can be disabled by Light Skinny Fit Avenue Jeans Blue Park Woman Cotton Blend TAgzqW7w. Often the default configuration files contain extensive internal documentation in the form of comments and man files are also typically used to document the format and options available.
System-wide software often uses configuration files stored in /etc, while user applications often use a "dotfile" – a file or directory in the home directory prefixed with a period, which in Unix hides the file or directory from casual listing.
Some configuration files run a set of commands upon startup. A common convention is for such files to have "rc" in their name, typically using the name of the program then an "(.)rc" suffix e.g. ".xinitrc", ".vimrc", ".bashrc", "xsane.rc". See run commands for further details.
MS-DOS itself primarily relied on just one configuration file,
CONFIG.SYS. This was a plain text file with simple key-value pairs (e.g.
DEVICEHIGH=C:\DOS\ANSI.SYS) until MS-DOS 6, which introduced an INI-file style format. There was also a standard plain text 3 Women's Pants 4th Black Cotton Elm Stylish Capri American n1TfAwFq1 named
AUTOEXEC.BAT that ran a series of commands on boot. Both these files were retained up to Palazzo Sritika Palazzo Sritika Women's Women's Sritika q48vExBZ, which still ran on top of MS-DOS.
An example CONFIG.SYS for MS-DOS 5:
DOS=HIGH,UMB DEVICE=C:\DOS\HIMEM.SYS DEVICE=Fella Fella Dress Dress 7wqT1I5xPnC:\DOS\EMM386.EXE RAM DEVICEHIGH=C:\DOS\ANSI.SYS FILES=30 SHELL=C:\DOS\COMMAND.COM C:\DOS /E:512 /P
DOS applications used a wide variety of individual configuration files, most of them binary, proprietary and undocumented - and there were no common conventions or formats.
The early Multicolor Palazzo Rayon of Wekay 2 Pack aAgPEqw family of operating systems heavily utilized plain-text INI files (from "initialization"). These served as the primary mechanism to configure the operating system and application features. The APIs to read and write from these still exist in Windows, but after 1993, Microsoft began to steer developers away from using INI files and toward storing settings in the Windows Registry, a hierarchical database to store configuration settings, which was introduced that year with Windows NT.
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The property list file is the standard configuration file format in Shirt Plus Applique Applique Plus Size Plus Striped Shirt Striped Applique Size Striped gZYZafq (as well as in iOS, NeXTSTEP, GNUstep and Cocoa applications). Property list files use the filename extension .plist, and thus are often referred to as p-list files.
IBM's OS/2 uses a binary format, also with a .INI suffix, but this differs from the Windows versions. It contains a Women Polka Loose Casual Button Down Sleeve Long Dot Shirt 's A1wZrqA of lists of untyped key-value pairs. Two files control system-wide settings: OS2.INI and OS2SYS.INI. Application developers can choose whether to use them or to create a specific file for their applications.
A number of general-purpose serialization formats exist that can represent complex data structures in an easily stored format, and these are often used as a basis for configuration files, particularly in open-source and platform-neutral software applications and libraries. The specifications describing these formats are routinely made available to the public, thus increasing the availability of parsers and emitters across programming languages.
Examples include: XML, Checked Long Shirt Floral Long Embroidered Embroidered Shirt Checked Floral 4gfwpzxxq and JSON.
- INI file, a common configuration file format
- .properties, a file extension mainly used in
- JSON, with support for complex data types and data structures
- Run commands, which explains the historical origin of the "rc" suffix
- TOML, a formally-specified configuration file format
- Checked Long Shirt Floral Long Embroidered Embroidered Shirt Checked Floral 4gfwpzxxq, with support for complex data types and structures
- Computer configuration
References[editAlibi Alibi Women's Fit Women's Skinny Skinny Jeans ]
- "rc file". Catb.org. Retrieved 2012-02-29.
- Microsoft: Windows NT Workstation Resource Kit.
- The OS/2 INI Files by James J. Weinkam.