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<td width="66%" height="25"><strong>Windows批处理的高级用法</strong></td>
<td width="18%"> <font color=red>热</font> <font color='#009999'></font></td>
<td width="13%">【字体：<a href="javascript:fontZoomA();" class="top_UserLogin">小</a> <a href="javascript:fontZoomB();" class="top_UserLogin">大</a>】</td>
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<td height="50" colspan="2" class="main_ArticleTitle" style="word-break:break-all;Width:fixed">Windows批处理的高级用法</td>
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<td colspan="2">作者：未知 文章来源：<a href='http://www.77169.com/ShowCopyFrom.asp?ChannelID=1006&SourceName=华夏收集'>华夏收集</a> 点击数：
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更新时间：2006-5-28</td>
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<TD><!--插入广告JS代码--></TD></TR></TBODY></TABLE>嗯，标题好像很大，貌似会图文并茂的讲解很多用法似的……嘿嘿，其实没这么复杂，只是从一个例子出发，抛砖引玉，引出Windows批处理中并不为我们注意的高级用法。真的很有用哦！<BR><BR>有这么一个需求，要求做一个批处理文件，能够自动执行某个目录中的几个可执行文件，并且把它们的屏幕输出存入一个Log文件中。这里涉及到两个问题：<BR>
<OL>
<LI>如何将屏幕输出转向到文件
<LI>如何确定Log的文件名 </LI></OL>这两个问题都比较简单。第一个问题，通过“>”和“>>”可以轻松搞定，第二个问题似乎也不难，因为Windows支持环境变量，其中有一个“%DATE%”代表当前的日期，还有个“%TIME%”代表当时的时间，精确到百分之一秒。似乎这已经足够了吧，于是写出下面的<a class="channel_keylink" href="http://hack.77169.com/List/List_36.html" target="_blank">脚本</a>：<BR>
<DIV style="MARGIN-LEFT: 40px"><SPAN style="FONT-FAMILY: Courier New">@echo off</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">SET LogFile=%DATE%%TIME%.log</SPAN><BR style="FONT-FAMILY: Courier New"><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app1.exe param1 param2 > %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app2.exe param1 param2 >> %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app3.exe param1 param2 >> %LogFile%</SPAN></DIV>但是，很可惜，它无法按预期结果运行，它只会生成一个没有扩展名的文件，形如“2006-05-25”。想了想，哦，明白了，因为%DATE%打出来的东西是“2006-05-25 星期四”，遇到空格之后重定向的机制就开始起作用了，它以为这就是文件名全称了。<BR>好了，那么我来加上引号，这下应该无敌了吧。<BR>
<DIV style="MARGIN-LEFT: 40px"><SPAN style="FONT-FAMILY: Courier New">@echo off</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">SET LogFile=<SPAN style="COLOR: rgb(255,0,0)">"</SPAN>%DATE%%TIME%.log<SPAN style="COLOR: rgb(255,0,0)">"</SPAN></SPAN><BR style="FONT-FAMILY: Courier New"><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app1.exe param1 param2 > %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app2.exe param1 param2 >> %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app3.exe param1 param2 >> %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"></DIV><BR>但是，还是很可惜，Windows会报告“参数错误”。这又是怎么了呢？嗯，原来，Windows不允许文件名或目录名中含有“:”，而%TIME%的输出结果中恰好有两个“:”。这就无语了。<BR>正在绝望之时，突然在命令行里鬼使神差的敲了一个“help set”，一切问题都明白了！以前都没有意识到啊，Windows批处理竟有如此强大的威力（当然，这还是没法和*nix比，不过已经比原来认识到的强多了）。<BR>现在知道了，这个<a class="channel_keylink" href="http://hack.77169.com/List/List_36.html" target="_blank">脚本</a>可以这样写：<BR>
<DIV style="MARGIN-LEFT: 40px"><SPAN style="FONT-FAMILY: Courier New">@echo off</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">SET LogFile=<SPAN style="COLOR: rgb(255,0,0)"></SPAN>%DATE%%TIME%<BR>REM 把 : 都替换成 -<BR>SET LogFile=%LogFile::=-%<BR>REM 把空格都替换成 -<BR>SET LogFile=%LogFile =-%<BR>REM 把 . 都替换成 -<BR>SET LogFile=%LogFile.=-%<BR><BR>SET LogFile=%LogFile%.log<BR style="FONT-FAMILY: Courier New"></SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app1.exe param1 param2 > %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app2.exe param1 param2 >> %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"><SPAN style="FONT-FAMILY: Courier New">app3.exe param1 param2 >> %LogFile%</SPAN><BR style="FONT-FAMILY: Courier New"></DIV>至于具体的原理，大家可以在命令行里面敲help set就可以清楚看到了，Windows的文档做的就是好啊。<BR>此外，还有help if和help call也很值得看，这些东西组合起来就构成了Windows批处理的高级用法。<BR><BR>嗯，说完了（噢，好像什么都没说啊……）。</span> </td>
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