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<p><FONT class=normalfont><B><font color=blue>shell简介</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>unix下常见的shell有sh（bourne shell，默认的shell），csh，ksh（korn shell），那我们选择哪一个shell呢？<br>
korn shell：是bourne shell的增强，也是偶的选择，它有很多很不错的特性是你的shell script简单高效and faster。<br>
bourne shell可是在任何unix下都可以找到的shell，选择它也很明智，这样你在各种unix都have a familar enviroment。<br>
cshbourne shell和korn shell大同小异，就象c＋＋ ，java，c#的差异，而csh便不同了，就象pascal，完全不同，不过也许你偏爱呀。<br>
<br>
每个用户用什么shell在增加用户时定义，如果你是root，你可以一劳永yi的用usermod －s<br>
/bin/ksh来是试自己login后便用ksh，普通用户要用ksh，可以在当前shell下敲ksh<br>
各个shell在不同的unix目录不同，用type命令可以准确的高诉你一个可找到的命令的类型和位置。有些unix下有whence，都可以啊<br>
exercise：type ksh<br>
用使自己的shell script坚持使用某一shell，那么在你shell的第一行如下写便可以了：<br>
以sco unix，ksh为例：<br>
#！ /bin/ksh<br>
所以你看到shell里这样的语句不要当成是注释啊。<br>
<br>
创建shell<br>
<br>
vi是unix下的编辑工具，功能强大啊，开始使用的时候不熟悉，感觉别扭，用不了多久，也许你就想在windows找一个vi工具用用了，偶便喜欢lemmy。<br>
$vi first<br>
echo “this is my first script"<br>
:x<br>
$first<br>
ksh:first:cannot execute<br>
A mistake?<br>
<br>
运行shell<br>
<br>
$ls -l first<br>
-rw-r--r-- 1 valentine 34 Mar 14 14:52 fisrt<br>
没有执行权限啊<br>
$chmod u+x first<br>
or $chmod a+x first or chmod 777 first or ....<br>
<br>
$first<br>
this is my first script<br>
<br>
OK.<br>
你也可以用不修改权限，而用以下方式运行：<br>
$sh first<br>
$ksh first<br>
这两种方式都是系统重新运行一个shell来解释执行first<br>
很多情况需要在当前shell运行，如何做到呢？<br>
$. first<br>
记住了，很多情况都会用着啊。<br>
<br>
That's all for today.<br>
<br>
commands list:<br>
ls ,vi ,whence ,type,chmod,usermod<br>
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