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Update Shell.md
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@ -262,7 +262,7 @@ echo $length2 #输出:5
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echo ${array[2]} #输出:3
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unset array[1]# 删除下标为1的元素也就是删除第二个元素
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for i in ${array[@]};do echo $i ;done # 遍历数组,输出: 1 3 4 5
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unset arr_number; # 删除数组中的所有元素
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unset array; # 删除数组中的所有元素
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for i in ${array[@]};do echo $i ;done # 遍历数组,数组元素为空,没有任何输出内容
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```
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