📄 6-3.htm
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<p class=MsoNormal align=right style='text-align:right'><a name="_top"></a><b><span
style='font-size:26.0pt;mso-bidi-font-size:12.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:#993366'>实验</span></b><b><i
style='mso-bidi-font-style:normal'><span lang=EN-US style='font-size:55.0pt;
mso-bidi-font-size:12.0pt;color:#993366'>6</span></i><span lang=EN-US
style='color:#993366'><o:p></o:p></span></b></p>
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</v:shape><![endif]--><![if !vml]><img width=729 height=46
src="6-3.files/image002.jpg" align=left hspace=12 v:shapes="_x0000_s1609"><![endif]><b><span
style='font-size:24.0pt;mso-bidi-font-size:12.0pt;font-family:黑体;mso-ascii-font-family:
"Times New Roman";color:navy'>输入</span></b><b><span lang=EN-US
style='font-size:24.0pt;mso-bidi-font-size:12.0pt;mso-fareast-font-family:黑体;
color:navy'>/</span></b><b><span style='font-size:24.0pt;mso-bidi-font-size:
12.0pt;font-family:黑体;mso-ascii-font-family:"Times New Roman";color:navy'>输出管理</span></b><b><span
lang=EN-US style='font-size:16.0pt;mso-bidi-font-size:12.0pt;mso-fareast-font-family:
黑体;color:navy'><span style='mso-spacerun:yes'> </span></span></b></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<p class=MsoNormal><span lang=EN-US> </span></p>
<p class=MsoNormal><span lang=EN-US> <a name="_Toc16587483"></a></span></p>
<h2><span style='mso-bookmark:_Toc16587483'><a name="_Toc41901935"><span
lang=EN-US>6.3<span style='mso-spacerun:yes'> </span>Linux重定向和管道</span></a></span></h2>
<p class=MsoNormal align=center style='text-align:center'><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US>(</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>实验估计时间：</span><span
lang=EN-US>90</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>分钟</span><span lang=EN-US>)</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US> </span></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_背景知识"><span style='mso-bookmark:
_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>背景知识</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_实验目的"><span style='mso-bookmark:
_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>实验目的</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_工具/准备工作"><span
style='mso-bookmark:_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>工具</span><span
lang=EN-US>/</span></b></span><span style='mso-bookmark:_Toc16587483'><b><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>准备工作</span></b></span><span style='mso-bookmark:_Toc16587483'></span></a><span
style='mso-bookmark:_Toc16587483'><b><span lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_实验内容与步骤"><span
style='mso-bookmark:_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>实验内容与步骤</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'><span style='mso-bookmark:_Toc16587483'><![if !supportLists]><span
lang=EN-US style='font-family:Wingdings;mso-fareast-font-family:Wingdings;
mso-bidi-font-family:Wingdings;mso-bidi-font-weight:bold'><span
style='mso-list:Ignore'>Ø<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]></span><a href="#_可选练习"><span style='mso-bookmark:
_Toc16587483'><b><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>可选练习</span></b></span><span
style='mso-bookmark:_Toc16587483'></span></a><span style='mso-bookmark:_Toc16587483'><b><span
lang=EN-US><o:p></o:p></span></b></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US> </span></span></p>
<h3><span style='mso-bookmark:_Toc16587483'><a name="_Toc41901936"></a><a
name="_背景知识"></a><span style='mso-bookmark:_Toc41901936'>背景知识</span></span></h3>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>在本实验中，我们将使用高级</span><span lang=EN-US>Linux</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>命令来完成重定向和管道。每一个</span><span
lang=EN-US>Linux</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>命令都有一个源作为标准输入，一个目的作为标准输出。命令的输入通常来自键盘</span><span lang=EN-US>
(</span></span><span style='mso-bookmark:_Toc16587483'><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>尽管它也可以来自文件</span><span
lang=EN-US>) </span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。命令通常输出到监视器或者屏幕上。</span><span lang=EN-US>Linux</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>计算环境使用重定向可以控制命令的</span><span
lang=EN-US>I/O</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。当试图把命令的输出保存到一个文件，以供以后查看的时候是很有用的。通过管道，可以取得一个命令的输出，把它作为另一个命令的进一步处理的输入。</span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>有几个元字符可用于输入</span><span lang=EN-US>/</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>输出重定向符号：输出重定向使用右尖括号</span><span
lang=EN-US> (></span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，又称大于号</span><span lang=EN-US>) </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>；输入重定向使用左尖括号</span><span
lang=EN-US> (<</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，又称小于号</span><span lang=EN-US>) </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>；出错输出重定向使用右尖括号之前有一个数字</span><span
lang=EN-US>2 (</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>如</span><span lang=EN-US>2>) </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。本实验重点在输出重定向。</span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>重定向命令的格式是：</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US><span
style='mso-spacerun:yes'> </span>Command
Redirection-Symbol File (text file or device file)</span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>标准输出比标准输入或标准出错更经常被重定向。许多命令，如</span><span lang=EN-US>ls</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>、</span><span
lang=EN-US>cat</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>、</span><span lang=EN-US>head</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>和</span><span
lang=EN-US>tail</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>产生标准输出到屏幕上，常常会希望把这个输出重定向到一个文件中，以便将来查看、处理或者打印。通过替换文件名，可以截获命令的输出，而不是让它到达默认的监视器上。</span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>最强大的元字符之一是管道符号</span><span lang=EN-US> (|) </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。管道取得一个命令的标准输出，把它作为标准输入传递给下一个命令</span><span
lang=EN-US> (</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>通常为</span><span lang=EN-US>more</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>命令、</span><span
lang=EN-US>lp (</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>行式打印机</span><span lang=EN-US>) </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
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