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bash debug

Run bash scripts in a safer way.

bash -x      调试执行
bash -n      测试语法

set -e 异常时马上退出
set -u 把所有未定义的变量视为错误
set -x debug开关
set -o pipefail 在管道连接的命令中，只要有任何一个命令失败（返回值非 0），则整个管道操作被视为失败

set -euxo pipefail

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  3. Not all the commands and scripts are tested in production environment, use at your own risk
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