2004-01-08 16:01:37 +01:00
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<varlistentry>
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2004-01-09 15:18:28 +01:00
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<term><option>--verbose</option> / <option>-v</option></term>
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2004-01-08 16:01:37 +01:00
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<listitem>
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<para>
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Increases the level of verbosity of diagnostic messages printed
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on standard error. For each Nix operation, the information
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printed on standard output is well-defined; any diagnostic
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information is printed on standard error, never on standard
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output.
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</para>
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<para>
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This option may be specified repeatedly. Currently, the
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following verbosity levels exist:
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</para>
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<variablelist>
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<varlistentry>
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<term>0</term>
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<listitem>
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<para>
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<quote>Errors only</quote>: only print messages explaining
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why the Nix invocation failed.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>1</term>
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<listitem>
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<para>
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<quote>Informational</quote>: print
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<emphasis>useful</emphasis> messages about what Nix is
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doing.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>2</term>
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<listitem>
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<para>
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<quote>Talkative</quote>: print more informational messages.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>3</term>
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<listitem>
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<para>
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<quote>Chatty</quote>: print even more informational messages.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>4</term>
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<listitem>
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<para>
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<quote>Debug</quote>: print debug information:
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>5</term>
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<listitem>
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<para>
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<quote>Vomit</quote>: print vast amounts of debug
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information.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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2004-01-13 17:35:43 +01:00
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<varlistentry>
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<term><option>--build-output</option> / <option>-B</option></term>
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<listitem>
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<para>
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Causes the output written by build actions to standard output
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and standard error to be echoed to standard error, regardless of
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verbosity level. By default, it is only echoed at a verbosity
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level of at least 4 (<quote>Debug</quote>), and is suppressed at
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lower levels. Note that it is always written to a log file in
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<filename><replaceable>prefix</replaceable>/nix/var/log/nix</filename>.
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</para>
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</listitem>
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</varlistentry>
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