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| <title>Using as: Command Line</title> |
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| <a name="Command-Line"></a> |
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| Next: <a href="Input-Files.html#Input-Files" accesskey="n" rel="next">Input Files</a>, Previous: <a href="Object-Formats.html#Object-Formats" accesskey="p" rel="prev">Object Formats</a>, Up: <a href="Overview.html#Overview" accesskey="u" rel="up">Overview</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Command-Line-1"></a> |
| <h3 class="section">1.4 Command Line</h3> |
| |
| <a name="index-command-line-conventions"></a> |
| |
| <p>After the program name <code>as</code>, the command line may contain |
| options and file names. Options may appear in any order, and may be |
| before, after, or between file names. The order of file names is |
| significant. |
| </p> |
| <a name="index-standard-input_002c-as-input-file"></a> |
| <a name="index-_002d_002d"></a> |
| <p><samp>--</samp> (two hyphens) by itself names the standard input file |
| explicitly, as one of the files for <code>as</code> to assemble. |
| </p> |
| <a name="index-options_002c-command-line"></a> |
| <p>Except for ‘<samp>--</samp>’ any command line argument that begins with a |
| hyphen (‘<samp>-</samp>’) is an option. Each option changes the behavior of |
| <code>as</code>. No option changes the way another option works. An |
| option is a ‘<samp>-</samp>’ followed by one or more letters; the case of |
| the letter is important. All options are optional. |
| </p> |
| <p>Some options expect exactly one file name to follow them. The file |
| name may either immediately follow the option’s letter (compatible |
| with older assemblers) or it may be the next command argument (<small>GNU</small> |
| standard). These two command lines are equivalent: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">as -o my-object-file.o mumble.s |
| as -omy-object-file.o mumble.s |
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