which of the following UNIX command allows scheduling program to be executed at the specifics time?

which of the following UNIX command allows scheduling program to be executed at the specifics time? Correct Answer cron

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Which of the following scheduling test can be used to show that no scheduling exist?
Which scheduling test is used to indicate that no scheduling exist even if there exist one?
Which scheduling algorithm is an optimal scheduling policy for mono-processor system?
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1. It is a eight phase program lasting about three to five years.
2. Through this program, an organisation can move systematically from the stage of examining managerial behaviour and style to the development and implementation of an "ideal strategic corporate model".
3. Behavioural science concepts and rigerous business logic are combined in the Grid OD Program's six phases.
4. The single most significant premise on which Grid OD rests in that the 5, 5 way of doing business which is acknowledged universally by managers as the soundest way to manage to achieve excellence.