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- </code></pre></div><p>再次运行<code>ls -l</code>命令,查看该目录下有哪些东西,了解各目录的作用</p> <ol start="5"><li><p>这时如果直接使用<code>cd</code>命令,当前路径是什么?尝试使用相应命令查看并验证</p></li> <li><p>使用mkdir建立一个子目录subdir</p></li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">mkdir</span> subdir
- </code></pre></div><ol start="7"><li>子目录创建成功了吗?让我们使用<code>ls</code>命令查看,并将工作目录更改到subdir</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">ls</span>
- $ <span class="token builtin class-name">cd</span> subdir
- </code></pre></div><h3 id="对文件和目录操作"><a href="#对文件和目录操作" class="header-anchor">#</a> 对文件和目录操作</h3> <ol><li>运行date > file1,然后运行cat file1,我们将看到什么信息?</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">date</span> <span class="token operator">></span> file1
- $ <span class="token function">cat</span> file1
- </code></pre></div><ol start="2"><li>尝试运行<code>cat subdir</code>,会有什么结果?如果回到上一个目录,再次运行,又会有什么结果?为什么?</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">cat</span> subdir
- $ <span class="token builtin class-name">cd</span> <span class="token punctuation">..</span>/
- </code></pre></div><ol start="3"><li>运行<code>man date >>file1</code>,我们能看到什么?再运行cat file1,又看到什么?</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">man</span> <span class="token function">date</span> <span class="token operator">>></span>file1
- $ <span class="token function">cat</span> file1
- </code></pre></div><ol start="4"><li>利用<code>ls -l file1</code>,该文件链接计数是多少?运行<code>ln file1 ../fa</code>,再运行<code>ls -l file1</code>,看链接计数有无变化?</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">ls</span> <span class="token parameter variable">-l</span> file1
- $ <span class="token function">ln</span> file1 <span class="token punctuation">..</span>/fa
- </code></pre></div><ol start="5"><li><p>用cat命令显示fa文件内容,注意fa文件所在位置,理解<code>ln</code>命令的作用是什么。</p></li> <li><p>尝试显示file1的前10行,后10行。</p></li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code><span class="token comment"># 尝试使用多种方法</span>
- $ <span class="token function">head</span> <span class="token parameter variable">-10</span> file1
- $ <span class="token function">cat</span> file1 <span class="token operator">|</span> <span class="token function">tail</span> <span class="token parameter variable">-n</span> <span class="token number">10</span>
- </code></pre></div><ol start="7"><li>运行<code>cp file1 file2</code>,然后<code>ls -l</code>,会看到什么?运行<code>mv file2 file3</code>,然后<code>ls -l</code>,又看到什么?运行<code>cat f*</code>,结果如何?</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">cp</span> file1 file2
- $ <span class="token function">mv</span> file2 file3
- $ <span class="token function">cat</span> f*
- </code></pre></div><ol start="8"><li>运行<code>rm file3</code>,然后<code>ls -l</code>,结果如何?</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ <span class="token function">rm</span> file3
- $ <span class="token function">ls</span> –l
- </code></pre></div><h3 id="vi编辑器的使用"><a href="#vi编辑器的使用" class="header-anchor">#</a> vi编辑器的使用</h3> <ol><li>建立一个文件,如file.c。输入一个C语言程序的各行内容,故意制造几处错误。</li></ol> <blockquote><p>这里有多种方式,你可以通过<code>touch 文件名</code>来建立空白文件,接着在对应文件夹下使用<code>vi 文件名</code>进行操作</p> <p>或者,直接通过打开vi编辑器,进入插入模式,最后将该文件存盘。</p></blockquote> <ol start="2"><li>运行<code>gcc file.c -o myfile</code>,编译该文件,会看到什么?尝试理解其含义。</li></ol> <div class="language-shell extra-class"><pre class="language-shell"><code>$ gcc file.c <span class="token parameter variable">-o</span> myfile
- </code></pre></div><ol start="3"><li>重新进入vi,对该文件进行修改。然后存盘,退出vi。重新编译该文件。如果编译通过了,可以用<code>./myfile</code>运行该程序。</li></ol> <blockquote><p><code>./</code>(点斜杠)的意思是执行当前目录下的某个可执行文件</p></blockquote> <ol start="4"><li>运行<code>man date > file2</code>,然后<code>vi file2</code>。使用<code>x</code>,<code>dd</code>等命令删除某些文本行。使用<code>u</code>命令复原此前的情况。</li></ol></div> <footer class="page-edit"><!----> <!----></footer> <!----> </main></div><div class="global-ui"></div></div>
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