Most UNIX administrators are used to combining UNIX commands with pipes and filters to perform particular tasks. However, this can be dangerous—especially if you have fat fingers—because a single typo can do a lot of damage. That’s why I like to construct and check commands before executing them. For example, suppose you’ve just assigned some new disks to an AIX LPAR and want to configure their attributes (e.g., algorithm, queue_depth, reserve_policy) before ...

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