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51 lines
1.4 KiB
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.. include:: kbd.rst
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.. _usage:
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Usage
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=====
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This chapter contains an overview of how to make use of **lnav**.
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Viewing Files
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-------------
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The files to view in **lnav** can be listed on the command-line or passed to the
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:ref:`:open<open>` command. If the path is a directory, all of the files in the
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directory will be opened and the directory will be monitored for files to be added
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or removed. A
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`glob pattern <https://en.wikipedia.org/wiki/Glob_(programming)>`_ can also be
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used to watch for files that match the pattern. The files that are found will be
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scanned to identify their file format. Files that match a log format will be
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collated and displayed in the LOG view. Plain text files can be viewed in the
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TEXT view, which can be accessed by pressing |ks| t |ke|.
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Log message parsing is the base that many of the other features mentioned in this
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chapter are built upon. Messages are matched against regular expressions defined
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in log format definitions. When **lnav** first opens a file, it will cycle through
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all of the known formats and try to match the beginning lines in the file against
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the patterns. When a match is found,
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Searching
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---------
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Filtering
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---------
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To reduce the amount of noise in a log file, **lnav** can filter out log messages
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based on the following criteria:
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* Regular expression match
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* Time
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* Log level
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Search Tables
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-------------
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