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74 lines
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<title>Command Line - Using as</title>
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Overview.html#Overview" title="Overview">
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<link rel="prev" href="Object-Formats.html#Object-Formats" title="Object Formats">
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<link rel="next" href="Input-Files.html#Input-Files" title="Input Files">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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<div class="node">
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<p>
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<a name="Command-Line"></a>Next: <a rel="next" accesskey="n" href="Input-Files.html#Input-Files">Input Files</a>,
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Previous: <a rel="previous" accesskey="p" href="Object-Formats.html#Object-Formats">Object Formats</a>,
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Up: <a rel="up" accesskey="u" href="Overview.html#Overview">Overview</a>
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<hr><br>
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</div>
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<h3 class="section">1.4 Command Line</h3>
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<p><a name="index-command-line-conventions-25"></a>
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After the program name <span class="command">as</span>, the command line may contain
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options and file names. Options may appear in any order, and may be
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before, after, or between file names. The order of file names is
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significant.
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<p><a name="index-standard-input_002c-as-input-file-26"></a><a name="index-_002d_002d-27"></a><span class="file">--</span> (two hyphens) by itself names the standard input file
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explicitly, as one of the files for <span class="command">as</span> to assemble.
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<p><a name="index-options_002c-command-line-28"></a>Except for <span class="samp">--</span> any command line argument that begins with a
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hyphen (<span class="samp">-</span>) is an option. Each option changes the behavior of
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<span class="command">as</span>. No option changes the way another option works. An
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option is a <span class="samp">-</span> followed by one or more letters; the case of
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the letter is important. All options are optional.
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<p>Some options expect exactly one file name to follow them. The file
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name may either immediately follow the option's letter (compatible
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with older assemblers) or it may be the next command argument (<span class="sc">gnu</span>
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standard). These two command lines are equivalent:
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<pre class="smallexample"> as -o my-object-file.o mumble.s
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as -omy-object-file.o mumble.s
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</pre>
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</body></html>
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