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@ -29,7 +29,7 @@ echo $NAME # => John (变量)
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echo "$NAME" # => John (变量)
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echo '$NAME' # => $NAME (确切的字符串)
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echo "${NAME}!" # => John! (变量)
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NAME = "John" # => Error (关于空间)
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NAME = "John" # => Error (关于空格)
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```
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### 注释
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