@ -57,7 +57,13 @@ read -t 10 name #设置指定时间内输入,超时主动退出
#### set 命令
```
set -u #设置变量不存在会报错停止往下执行
set -x #将脚本的执行过程输出方便调试
set -e #设置命令执行不成功停止执行
set -a my_env #将变量设置为环境变量
```
#### unset 命令
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