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                # 第四章 變量與參數 ### 本章目錄 - [4.1 變量替換](04_1_variable_substitution.md) - [4.2 變量賦值](04_2_variable_assignment.md) - [4.3 Bash變量弱類型](04_3_bash_variables_are_untyped.md) - [4.4 特殊變量類型](04_4_special_variable_types.md) 變量(variable)在編程語言中用來表示數據。它本身只是一個標記,指向數據在計算機內存中的一個或一組地址。 變量通常出現在算術運算,數量操作及字符串解析中。
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