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| <h3 class="section">1.4 Command Line</h3> |
| |
| <p><a name="index-command-line-conventions-25"></a> |
| After the program name <samp><span class="command">as</span></samp>, 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-26"></a><a name="index-g_t_002d_002d-27"></a><samp><span class="file">--</span></samp> (two hyphens) by itself names the standard input file |
| explicitly, as one of the files for <samp><span class="command">as</span></samp> to assemble. |
| |
| <p><a name="index-options_002c-command-line-28"></a>Except for ‘<samp><span class="samp">--</span></samp>’ any command line argument that begins with a |
| hyphen (‘<samp><span class="samp">-</span></samp>’) is an option. Each option changes the behavior of |
| <samp><span class="command">as</span></samp>. No option changes the way another option works. An |
| option is a ‘<samp><span class="samp">-</span></samp>’ followed by one or more letters; the case of |
| the letter is important. All options are optional. |
| |
| <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 (<span class="sc">gnu</span> |
| standard). These two command lines are equivalent: |
| |
| <pre class="smallexample"> as -o my-object-file.o mumble.s |
| as -omy-object-file.o mumble.s |
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