User Guide for adjusting process priority in Linux using the renice command.

Here is a guide on how to use the renice command to adjust the priority of a process.

1. The basic syntax of the renice command is as follows:
2. renice [-n ] [-g|p|u ]
3. Priority increment (-n): Use the -n parameter to specify the priority increment for the process being adjusted. The range of values for the priority increment is from -20 to 19, with smaller values indicating higher priority.
4. Process group/process number/user name (-g/-p/-u): Use the -g, -p, or -u parameter to specify the process group, process number, or user name for which you want to adjust the priority. Multiple parameters can be used simultaneously to specify multiple processes.
5. 原句：这个电视节目每周都会播放。
   改写：This TV show airs every week.
6. Increase the priority of the process with the ID 1234 by 5 points by using the command:
   renice -n 5 -p 1234
7. Decrease the priority of all processes with the username john by 2 levels:
   renice -n -2 -u john
8. Increase the priority of all processes with process group ID 5678 by 10:
   renice -n 10 -g 5678
9. The command “renice” requires root privileges or to be run as the owner of the process.

Please take note:

1. Processes with smaller priority increments have higher priority.
2. Only the root user or the process owner can increase the priority of a process.
3. Please use the “renice” command with caution, as adjusting the priority may impact the performance and stability of the system.