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[2017-09-27 13:44:35]: git提交不带变更的commit：git commit --allow-empty -m "Empty commit to deployments" then git push

[2017-06-13 10:40:12]linux sub process进程默认托管于父进程，所以在父进程中wait will work，但是在别的进程wait(pid)就报错no child process

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