If the server is a job server, the script checks to find out what kind of instance it is running on.
如果这个服务器只是一个作业服务器,那么脚本就会检查它运行在哪一个实例上。
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A Continuous Integration server constantly checks the code out of source control, builds it, runs the unit tests against it, and reports any build failures to the developers, usually via E-mail.