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.. _cli:
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Command Line Interface
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======================
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The following options can be used when starting **lnav**. There are not
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many flags because the majority of the functionality is accessed using
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the :option:`-c` option to execute :ref:`commands<commands>` or
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:ref:`SQL queries<sql-ext>`.
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Options
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-------
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.. option:: -h
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Print these command-line options and exit.
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.. option:: -H
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Start lnav and switch to the help view.
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.. option:: -C
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Check the given files against the configuration, report any errors, and
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exit. This option can be helpful for validating that a log format is
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well-formed.
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.. option:: -c <command>
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Execute the given lnav command, SQL query, or lnav script. The
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argument must be prefixed with the character used to enter the prompt
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to distinguish between the different types (i.e. ':', ';', '|').
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This option can be given multiple times.
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.. option:: -f <path>
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Execute the given command file. This option can be given multiple times.
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.. option:: -I <path>
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Add a configuration directory.
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.. option:: -i
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Install the format files in the :file:`.lnav/formats/` directory.
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Individual files will be installed in the :file:`installed`
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directory and git repositories will be cloned with a directory
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name based on their repository URI.
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.. option:: -u
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Update formats installed from git repositories.
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.. option:: -d <path>
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Write debug messages to the given file.
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.. option:: -n
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Run without the curses UI (headless mode).
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.. option:: -r
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Recursively load files from the given base directories.
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.. option:: -t
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Prepend timestamps to the lines of data being read in on the standard input.
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.. option:: -w <path>
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Write the contents of the standard input to this file.
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.. option:: -V
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Print the version of lnav.
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.. option:: -q
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Do not print the log messages after executing all of the commands.
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Environment Variables
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---------------------
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.. envvar:: XDG_CONFIG_HOME
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If this variable is set,
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.. envvar:: HOME
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Examples
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--------
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To load and follow the system syslog file:
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.. prompt:: bash
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lnav
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To load all of the files in :file:`/var/log`:
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.. prompt:: bash
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lnav /var/log
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To watch the output of make with timestamps prepended:
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.. prompt:: bash
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make 2>&1 | lnav -t
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