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62 lines
1.8 KiB
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Introduction
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============
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The Log File Navigator, **lnav**, is an advanced log file viewer for the
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terminal. It provides an :ref:`easy-to-use interface<ui>` for monitoring and
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analyzing your log files with little to no setup. Simply point **lnav** at
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your log files and it will automatically detect the :ref:`log-formats`, index
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their contents, and display a combined view of all log messages. You can
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navigate through your logs using a variety of :ref:`hotkeys<hotkeys>`.
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:ref:`Commands<commands>` give you additional control over **lnav**'s behavior
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for doing things like applying filters, tagging messages, and more. You can
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then analyze your log messages using the :ref:`sql-ext`.
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Dependencies
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------------
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When compiling from source, the following dependencies are required:
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* `NCurses <http://www.gnu.org/s/ncurses/>`_
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* `PCRE <http://www.pcre.org>`_ -- Versions greater than 8.20 give better
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performance since the PCRE JIT will be leveraged.
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* `SQLite <http://www.sqlite.org>`_
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* `ZLib <http://wwww.zlib.net>`_
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* `Bzip2 <http://www.bzip.org>`_
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* `Readline <http://www.gnu.org/s/readline>`_
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Installation
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------------
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Check the `downloads page <http://lnav.org/downloads>`_ to see if there are
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packages for your operating system. Compiling from source is just a matter of
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doing:
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.. prompt:: bash
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./configure
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make
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sudo make install
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Viewing Logs
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------------
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The arguments to **lnav** are the log files, directories, or URLs to be viewed.
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For example, to view all of the CUPS logs on your system:
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.. prompt:: bash
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lnav /var/log/cups
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The formats of the logs are determined automatically and indexed on-the-fly.
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See :ref:`log-formats` for a listing of the predefined formats and how to
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define your own.
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If no arguments are given, **lnav** will try to open the syslog file on your
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system:
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.. prompt:: bash
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lnav
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