Change a locale definition (as opposed to a locale setting)

 Changing a locale definition involves modifying or creating custom locale definitions in Linux. Locale definitions are stored in text files and specify how various aspects of the system, such as character encoding, date and time formats, and currency symbols, are presented to users. Modifying or creating a custom locale definition is a more advanced task and should be done with caution. Here's a general outline of how you can change a locale definition:


1. **Locate Existing Locale Definitions**:

   Locale definitions are typically stored in the `/usr/share/i18n/locales/` directory. Use the `locale` command to list the available locales:


   ```bash

   locale -a

   ```


   This command will show you a list of installed locales. Choose a locale definition that is close to what you want to create or modify.


2. **Copy an Existing Locale Definition**:

   To create a new custom locale or modify an existing one, you'll typically make a copy of an existing locale definition and edit it. Use a text editor to create a new file or copy an existing locale definition file:


   ```bash

   sudo cp /usr/share/i18n/locales/en_US /usr/share/i18n/locales/custom_locale

   ```


3. **Edit the Locale Definition**:

   Open the copied locale file with a text editor and make the necessary changes. The locale file contains various settings for the locale, including LC_TIME (date and time formats), LC_MONETARY (currency format), LC_NUMERIC (number format), LC_MESSAGES (language-related settings), and more. Carefully edit the specific settings you want to change.


4. **Compile the Locale Definition**:

   After making changes to the locale definition, compile it into a binary format using the `localedef` command:


   ```bash

   sudo localedef -i /usr/share/i18n/locales/custom_locale -f UTF-8 /usr/lib/locale/custom_locale

   ```


   Adjust the paths and locale name to match your locale definition file.


5. **Set the Custom Locale as Default**:

   You can set the newly created or modified custom locale as the default locale for the system by using the `update-locale` command. Provide the locale name as the argument:


   ```bash

   sudo update-locale LC_ALL=custom_locale

   ```


   This command updates the system-wide locale settings to use the custom locale you've defined.


6. **Log Out and Log In**:

   To apply the changes, log out and log back in, or you can restart the system.


Please note that creating or modifying locale definitions can affect various aspects of the system, including date and time formatting, number formatting, and more. Be careful when making changes, as incorrect settings can impact the system's usability. It's also recommended to create a backup of your system before making significant changes to locale definitions.

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