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nice [± n ] command

Change the execution priority for command , or, if none is given, change priority for the current shell. (See also nice in Chapter 2 .) The priority range is -20 to 20, with a default of 4. The range is backwards from what you might expect: -20 gives the highest priority (fastest execution); 20 gives the lowest.

+ n

Add n to the priority value (lower job priority).

- n

Subtract n from the priority value (raise job priority). Privileged users only.

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