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@@ -109,6 +109,7 @@ echo  "helloworld!"
 ### Shell 字符串入门
 
 字符串是 shell 编程中最常用最有用的数据类型（除了数字和字符串，也没啥其它类型好用了），字符串可以用单引号，也可以用双引号。这点和 Java 中有所不同。
+在单引号中所有的特殊符号，如$和反引号都没有特殊含义。在双引号中，除了"$","\"和反引号，其他的字符没有特殊含义。
 
 **单引号字符串：**