https://blog.youkuaiyun.com/boyce_dongzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/boyce_dong/article/details/83911669https://blog.youkuaiyun.com/boyce_dong/article/details/83911669boyce_dongTue, 26 Apr 2011 20:30:09 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83881902https://blog.youkuaiyun.com/boyce_dong/article/details/83881902boyce_dongWed, 30 Mar 2011 17:16:59 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83880944https://blog.youkuaiyun.com/boyce_dong/article/details/83880944boyce_dongTue, 29 Mar 2011 16:19:52 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83872671https://blog.youkuaiyun.com/boyce_dong/article/details/83872671boyce_dongWed, 16 Mar 2011 15:12:10 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/6135652https://blog.youkuaiyun.com/boyce_dong/article/details/6135652boyce_dongThu, 13 Jan 2011 17:13:00 +0800LANG=en_US.UTF-8
设置securecrt的字符编码是UTF-8
vi 打开UTF-8编码文件，显示正常！]]>https://blog.youkuaiyun.com/boyce_dong/article/details/6134618https://blog.youkuaiyun.com/boyce_dong/article/details/6134618boyce_dongThu, 13 Jan 2011 14:02:00 +0800
用途

求表达式变量的值。
语法
expr Expression
描述

expr 命令读入 Expression 参数，计算它的值，然后将结果写入到标准输出。

您必须对 Expression 参数应用以下规则：用空格隔开每个项。 用 / （反斜杠） 放在 shell 特定的字符前面。 对包含空格和其他特殊字符的字符串要用引号括起来。

整数前面可]]>https://blog.youkuaiyun.com/boyce_dong/article/details/6133827https://blog.youkuaiyun.com/boyce_dong/article/details/6133827boyce_dongThu, 13 Jan 2011 10:27:00 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83805390https://blog.youkuaiyun.com/boyce_dong/article/details/83805390boyce_dongFri, 31 Dec 2010 17:27:28 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83560750https://blog.youkuaiyun.com/boyce_dong/article/details/83560750boyce_dongWed, 03 Mar 2010 14:31:08 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83552961https://blog.youkuaiyun.com/boyce_dong/article/details/83552961boyce_dongMon, 01 Feb 2010 11:22:34 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83532862https://blog.youkuaiyun.com/boyce_dong/article/details/83532862boyce_dongFri, 22 Jan 2010 16:05:40 +0800https://blog.youkuaiyun.com/boyce_dong/article/details/83532857https://blog.youkuaiyun.com/boyce_dong/article/details/83532857boyce_dongFri, 22 Jan 2010 15:59:12 +0800