okular

Okular is a popular command line tool used for viewing and annotating documents in various formats. Developed mainly for the KDE desktop environment, it is highly versatile and can be used to view documents in formats like PDF, PostScript, DjVu, CHM, and others.

One notable feature of Okular is its ability to handle different types of annotations, such as highlighting text, adding notes, drawing shapes, and attaching files. These annotations are saved within the document itself and can be easily shared with others.

The tool also offers features like text selection, searching within documents, and reflowing text for better readability. It has a user-friendly interface with a toolbar for quick access to commonly used functions.

Okular supports tabbed viewing, allowing users to open multiple documents simultaneously. It also has a thumbnail panel that provides an overview of the document pages, making it easy to navigate through large documents.

Additionally, Okular allows users to customize their viewing preferences by adjusting settings like zoom level, page layout, and color scheme. It also provides options for creating presentation slides from documents, which can be useful for sharing content with others in a slideshow format.

Moreover, Okular integrates well with other KDE applications, making it seamless to open and view documents from within the environment. It also supports various keyboard shortcuts for quick navigation and annotation.

Lastly, Okular has excellent performance and is known for being fast and responsive, even when handling large files. Overall, it is a robust and feature-rich command line tool for document viewing and annotation purposes.