Scheduled Cron Jobs 调度时钟守护任务
Normally, you run commands with the cron and at facilities at some point when you may not be around, so the usual assumption is that these scheduled jobs do not have access to a display.
通常，当您不在计算机附近时，一般使用cron和at实用程序运行命令，这些程序通常会认为预定的作业不能访问播放器的图形化表示。
Typically, the process of building the application and running the test suite is automated and scheduled as nightly or weekly jobs.
一般情况下，这个构建应用软件和运行测试单元的过程都是自动的安排有序地每夜或者每周运行的工作。
So, even if 50 jobs are scheduled to run at 23:00, since they are spooled, they run sequentially one at a time.
所以，即使把50个作业都安排在23：00运行，由于采用了假脱机机制，它们会连续地逐一运行。
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