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                ## 1.語法 if..then..else..fi的語法: ``` #!/bin/bash if [ 條件語句 ];then # 推薦書寫方式 執行內容 else 執行內容2 fi # 或 if [ 條件語句 ] then 執行內容 else 執行內容2 fi ``` ## 2.案例 1.if..then..else..fi的案例,比較兩個值是否相等。 ``` #!/bin/sh a=10 b=20 if [ $a == $b ];then echo "a is equal to b" else echo "a is not equal to b" fi ```
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