What is .d file in linux

The ".d" file in Linux represents: 1. Dependency file, where d means dependence; 2. Default configuration file, where d means default; 3. Dynamic file, where d means Dynamic.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is .d file in Linux

• Dependency file: dependence

• .d may also mean default, Indicates the default (configuration) file,

• may also mean Dynamic, indicating a file with dynamic meaning.

Folders with .d are relatively common. For example, there are many ,, under /etc, indicating that there are system default configuration files under the folder.

Generally, in order to maintain compatibility with the original configuration method, the .d ending directory is added.

For example: /etc/X11/xorg.conf This was originally a file, but now there is also a directory such as /etc/X11/xorg.conf.d. The relevant settings of the graphics card driver were originally placed in /etc In the file /X11/xorg.conf, in order to make the configuration file concise and flexible, the configuration can be allocated according to the situation and thrown into /etc/X11/xorg.conf.d... like "rules" To add... the system will automatically go to /etc/X11/xorg.conf.d to find these rules and set them according to the rules. This can maintain the previous /etc/X11/xorg.conf method compatibility.

Another example: In yum-based distributions, /etc/yum.repo is the yum configuration file. You can throw all yum sources into the yum.repo file. Now you can also put different sources All configuration files are thrown into /etc/yum.repo.d, and only some common configuration options are set in yum.repo. In this way, any source that is no longer wanted can be deleted from /etc/yum.repo.d. As long as it doesn't affect other things, the same principle applies if you add more sources.

There are also /etc/env.d, /etc/profile.d, /etc/udev.rules.d, etc... They are all the same~

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