The files `/usr/share/et/et_c.awk` and `/usr/share/et/et_h.awk` on your Linux system are likely part of the `e2fsprogs` package, which provides utilities for managing the ext2, ext3, and ext4 filesystems. Specifically, these files are used by the `et` (error table) subsystem in `e2fsprogs`.

### Details:

1. **et_c.awk**: This file is an AWK script used to generate C code for error tables. It processes error definitions and produces a corresponding C source file that can be compiled into a program to handle these errors.

2. **et_h.awk**: This file is an AWK script used to generate header files for error tables. Similar to `et_c.awk`, it processes error definitions but instead produces a header file that can be included in C source code to handle these errors.

### Purpose:

- **Error Table System**: The error table system in `e2fsprogs` is designed to provide a mechanism for defining and handling errors in a structured way. It allows the developers to create a set of error codes and their corresponding messages, which can then be used consistently throughout the software.

### Location and Usage:

- **Location**: `/usr/share/et/` is the directory where these AWK scripts are stored. This directory is part of the shared data for the error table system.
- **Usage**: These AWK scripts are typically not invoked directly by users. Instead, they are used by the build process of `e2fsprogs` or related utilities to generate the necessary C source and header files for error handling.

### Conclusion:

These files are part of the infrastructure for handling errors in the `e2fsprogs` package, which is essential for the management of ext2, ext3, and ext4 filesystems on your Linux system. They contribute to the automated generation of code for error handling, ensuring consistency and maintainability in the software.