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The nice command in the Linux system executes the program with a changed priority, and if no program is specified, the current scheduling priority is printed.

Syntax nice [- n adjustment] [- adjustment] [--adjustment=adjustment] [--help] [--version] [command [arg...]] Parameter description:

-n adjustment,-adjustment,-adjustment=adjustment all add adjustment to the original priority order.

-help displays a help message

-version displays version information

Instance sets the priority of the program when it is running

# vi & / / background run [1] 15297 # nice vi & / / set the default priority [2] 15298 [1] + Stopped vi # nice-n 19 vi & / / set the priority to 19 [3] 15299 [2] + Stopped nice vi # nice-n-20 vi & / / set the priority to-20 [4] 15300 [3] + Stopped nice-n 19 vi # ps- L / / display process F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 4 S 0 15278 15212 15212-1208 wait pts/2 00:00:00 bash 0 T 0 15297 15278 0 800-2687 signal pts/2 00:00:00 vi 0 T 0 15298 15278 090 10-2687 signal pts/2 00:00:00 vi 0T 015299 15278 1 99 19-2687 signal pts/2 00:00:00 vi 4 T 015300 15278 3 60-20-2687 signal Pts/2 00:00:00 vi 4 R 0 15301 15278 800-625-pts/2 00:00:00 ps [4] + Stopped nice-n-20 vi add 1 to the priority of ls and execute

Nice-n 1 ls increases the priority of ls by 10 and executes

Nice ls Note: priority (priority) is used by the operating system to determine the parameters assigned by CPU. Linux uses the "round-robin" algorithm to schedule CPU. The higher the priority, the more CPU time it is likely to get.

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