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<title>第九章 文件</title>
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<div style='position:absolute;top:0%;left:0%;width:100.0%;height:100.0%'><span
lang=EN-US style='color:black;mso-color-index:1;mso-fareast-language:ZH-CN'><b>9.1
</b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;color:black;
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<div class=B1 style='mso-margin-left-alt:507;mso-text-indent-alt:312'></div>
<div class=B2 style='mso-margin-left-alt:780;mso-text-indent-alt:624'></div>
<div class=B3 style='mso-margin-left-alt:1092;mso-text-indent-alt:936'></div>
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<div id="_x0000_s133123_0_10" class=B style='mso-line-spacing:"120 20 0";
mso-margin-left-alt:234;position:absolute;top:23.0%;left:10.67%;width:86.51%;
height:5.5%;white-space:nowrap'><span style='mso-special-format:nobullet;
display:none'>•</span><span style='font-family:宋体;mso-ascii-font-family:宋体;
mso-fareast-font-family:宋体;font-size:88%'><b>一、文件及其结构<span style='mso-tab-count:
1;width:1.44%'> </span> </b></span></div>
<div id="_x0000_s133123_10_29" class=B style='mso-line-spacing:"120 20 0";
mso-margin-left-alt:234;position:absolute;top:31.25%;left:10.67%;width:86.51%;
height:4.75%;white-space:nowrap'><span style='mso-special-format:nobullet;
display:none'>•</span><span style='font-family:宋体;mso-ascii-font-family:宋体;
font-size:75%'><b> </b></span><span style='font-family:宋体;mso-ascii-font-family:
宋体;mso-fareast-font-family:宋体;font-size:75%;color:red'><b>文件:</b></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
font-size:75%'><b>存储在外部介质上数据的集合。 </b></span></div>
<div id="_x0000_s133123_29_54" class=B style='mso-line-spacing:"120 20 0";
mso-margin-left-alt:234;position:absolute;top:38.75%;left:10.67%;width:94.75%;
height:4.75%;white-space:nowrap'><span style='mso-special-format:nobullet;
display:none'>•</span><span style='font-family:宋体;mso-ascii-font-family:宋体;
font-size:75%;color:#0033CC'><b> </b></span><span style='font-family:宋体;
mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;font-size:75%'><b>要求操作系统中的文件系统能提供用户</b></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
font-size:75%;color:#0033CC'><b>按名存取</b></span><span style='font-family:宋体;
mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;font-size:75%'><b>方式 </b></span></div>
<div id="_x0000_s133123_54_68" class=B style='mso-line-spacing:"120 20 0";
mso-margin-left-alt:234;position:absolute;top:46.25%;left:10.67%;width:86.51%;
height:4.75%;white-space:nowrap'><span style='mso-special-format:nobullet;
display:none'>•</span><span style='font-family:宋体;mso-ascii-font-family:宋体;
font-size:75%;color:#0033CC'><b> </b></span><span style='font-family:宋体;
mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;font-size:75%'><b>在操作系统中有两种文件: </b></span></div>
<div id="_x0000_s133123_68_94" class=B style='mso-line-spacing:"120 20 0";
mso-margin-left-alt:234;position:absolute;top:53.75%;left:10.67%;width:86.51%;
height:4.75%;white-space:nowrap'><span style='mso-special-format:nobullet;
display:none'>•</span><span style='font-family:宋体;mso-ascii-font-family:宋体;
font-size:75%;color:#0033CC'><b><span
style='mso-spacerun:yes'>
</span>字符流无结构文件</b></span><span style='font-family:宋体;mso-ascii-font-family:
宋体;mso-fareast-font-family:宋体;font-size:75%'><b>和</b></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
font-size:75%;color:#0033CC'><b>记录式有结构文件 </b></span></div>
<div id="_x0000_s133123_94_148" class=B style='mso-line-spacing:"120 20 0";
mso-margin-left-alt:234;position:absolute;top:60.5%;left:10.67%;width:102.8%;
height:18.0%;white-space:nowrap'><span style='position:absolute;top:0%;
left:0%;width:100.0%;height:29.16%'><span style='mso-special-format:nobullet;
display:none'>•</span><span style='font-size:75%'><b><span
style='mso-spacerun:yes'> </span></b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体;font-size:75%;color:red'><b>磁盘文件是由数据记录组成</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:75%'><b>。记录是计算机处理数据的基</b></span></span><span
style='position:absolute;top:38.88%;left:4.0%;width:90.16%;height:26.38%'><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:75%'><b>本单位,它由一组具有共同属性相互关联的数据项组</b></span></span><span
style='position:absolute;top:70.83%;left:4.0%;width:80.14%;height:29.16%'><span
style='font-family:宋体;mso-fareast-font-family:宋体;font-size:75%'><b>成。</b></span><span
style='font-size:75%'><b> </b></span></span></div>
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