okular

View document files, primarily PDFs

TLDR

Launch document viewer

$ okular

Open specific documents

$ okular [path/to/file1 path/to/file2 ...]

Open a document at a specific page

$ okular --page [page_number] [path/to/file]

Open a specific document in presentation mode

$ okular --presentation [path/to/file]

Open a specific document and start a print dialog

$ okular --print [path/to/file]

Open a document and search for a specific string

$ okular --find [search_string] [path/to/file]

--presentation
    Start Okular in presentation mode.

--print
    Print the specified file(s) directly without showing the GUI. Useful for scripting.

--unique
    If an instance is already running for the same file, then focus the running instance instead of opening a new one.

--noraise
    Do not raise the existing Okular window when opening a file via the command line.

--find text
    Opens the document and searches for the first occurrence of the provided text.

--version
    Show version information.

--help
    Show help message.

--help-all
    Show all options.

--author
    Show author information.

DESCRIPTION

Okular is a universal document viewer developed by KDE. It allows users to view various types of documents, including PDF, PostScript, DjVu, XPS, ePub, and Comic Book Archive formats (CBR and CBZ). Okular offers many features such as annotations, highlighting, and table of contents navigation. Its user-friendly interface and extensive format support make it a valuable tool for viewing and interacting with documents on Linux and other Unix-like operating systems.
Okular aims to be a comprehensive solution for viewing a wide range of document types.
The application leverages KDE's frameworks to provide a seamless user experience and is actively maintained by the KDE community. It also support integration with online services for file storage.

DOCUMENT FORMATS

Okular supports various document formats, including PDF, PostScript, DjVu, XPS, ePub, CBR, and CBZ. The level of support for each format may vary.

ANNOTATIONS

Okular allows adding annotations to documents, such as highlights, underlines, and comments. These annotations can be saved and shared with others.

CONFIGURATION

Okular settings, such as default zoom level, can be customized in the Okular configuration window.KDE stores this configuration.

HISTORY

Okular started as part of the KDE project, initially focusing on PDF support but expanded over time to handle a wide range of document formats. Its development has been driven by the need for a versatile and feature-rich document viewer within the KDE ecosystem. Over the years, it has become a popular choice for users seeking an open-source alternative to proprietary document viewers. The first commit was in 2005. Development happens in sync with the KDE Frameworks releases.