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- <a name="Filter-Mode"></a>
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- <a name="Filter-Mode-1"></a>
- <h3 class="subsection">1.2.1 Filter Mode</h3>
- <a name="index-filter-mode"></a>
- <a name="index-modes-2"></a>
- <p>In filter mode, the argument to the function given by the virtual code
- is taken from standard input, and the result is written to standard
- output, except for error messages resulting from a failure to evaluate
- the function, which are written to standard error.
- See section <a href="Diagnostics.html#Diagnostics">Diagnostics</a>. Filter mode is indicated whenever these three
- conditions are all met.
- </p>
- <ul>
- <li>
- Either at least one of the filter mode options appears on the command
- line preceding the first filename parameter, or there are no options at
- all. See section <a href="Filter-Mode-Options.html#Filter-Mode-Options">Filter Mode Options</a>.
- </li><li>
- Exactly one filename parameter appears on the command line,
- which is the name of the virtual machine code file.
- </li><li>
- Either the filename comes last on the command line, or the
- ‘<samp>--unparameterized</samp>’ option precedes it, causing
- everything following it to be ignored.
- </li></ul>
-
- <p>Examples:
- </p>
- <dl compact="compact">
- <dt> <kbd>avram mynewapp < inputfilename</kbd></dt>
- <dd><a name="index-standard-input-1"></a>
- <p>In this example, filter mode is recognized by default because there are
- no options or input files on the command line to indicate
- otherwise. (The input file redirected into standard input is not treated
- by the shell as a command line argument.)
- </p></dd>
- <dt> <kbd>cat somefile | avram -r coolprog > outputfile</kbd></dt>
- <dd><p>In this example, the ‘<samp>-r</samp>’ option gives it away, being one of the
- filter mode options, in addition to the fact that there are no input
- file parameters or application-specific options.
- </p></dd>
- <dt> <kbd>avram -u devilmaycare.avm --bogusoption ignoredparameter</kbd></dt>
- <dd><p>In this case, filter mode is forced by the ‘<samp>-u</samp>’
- option despite indications to the contrary.
- </p></dd>
- </dl>
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