The basic tool for timing things in a shell script is the sleep command, which causes the running shell to stop execution for a specified time.

shell脚本中执行定时的基本工具是sleep命令，该命令将使运行中的shell在指定的一段时间内暂停执行。

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Even if you're not heading back to school, it's still a great time to get into the "back-to-school" spirit and brush up on some basic running skills.

也许你并不回学校，但依然是个改善你跑步技巧的“新学期”。

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This paper introduces the basic concepts of SET, the primary technologies involved and the running procedure, at the same time it analyses how SET implement the security of e - commerce.

这里详细介绍了SET的基本概念、所使用的主要技术以及运行的过程，同时分析了SET是怎样解决网上交易安全性的。

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Some of the conditions we have to work and operate in for long periods of time lack basic things like electricity and running water, before you get on to providing the security that we're there to do.

BBC: Royal Welsh marks homecoming in Cardiff parade