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Merge pull request #407 from ipofss/patch-4

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feat:加入提示语
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SnailClimb 2019-07-25 22:10:25 +08:00 committed by GitHub
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docs/operating-system/Shell.md
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@ -260,7 +260,7 @@ echo $length #输出：5
echo $length2 #输出：5 echo $length2 #输出：5
# 输出数组第三个元素 # 输出数组第三个元素
echo ${array[2]} #输出：3 echo ${array[2]} #输出：3
unset array[1]# 删除下表为1的元素也就是删除第二个元素 unset array[1]# 删除下标为1的元素也就是删除第二个元素
for i in ${array[@]};do echo $i ;done # 遍历数组，输出： 1 3 4 5 for i in ${array[@]};do echo $i ;done # 遍历数组，输出： 1 3 4 5
unset arr_number; # 删除数组中的所有元素 unset arr_number; # 删除数组中的所有元素
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 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
@ -283,7 +283,7 @@ for i in ${array[@]};do echo $i ;done # 遍历数组，数组元素为空，没
![算数运算符](http://my-blog-to-use.oss-cn-beijing.aliyuncs.com/18-11-22/4937342.jpg) ![算数运算符](http://my-blog-to-use.oss-cn-beijing.aliyuncs.com/18-11-22/4937342.jpg)
我以加法运算符做一个简单的示例： 我以加法运算符做一个简单的示例（注意：不是单引号，是反引号）：
```shell ```shell
#!/bin/bash #!/bin/bash