Periodic Command Execution 周期性命令之执行
A Timer provides for delayed or periodic execution of work.
Timer 负责延迟工作或定期工作的执行。
Tcsh has a great feature that lets you perform such periodic execution of events with ease.
tcsh 的一个出色特性使我们能够轻松地定期执行特定的命令。
Trusted Execution supports the run-time integrity check whenever any command is executed, whereas the TCB mostly does the periodic checking of system integrity.
可信执行支持在每当执行任何命令的时候执行运行时完整性检查，而TCB主要执行定期的系统完整性检查。
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