The nice command is used to start another command with a given nice level. The nice level is a value that affects the scheduling priority of a process. A lower nice level means a higher priority, and a higher nice level means a lower priority. The default nice level is 0, and the range is from -20 to 19. Only the superusercan assign a negative nice level to a process. The nice command can also be used to display the current nice level of a process by using the -n option. References:
LPI Learning Materials, Chapter 3.3, Process Management
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