#!/bin/bash

TARGET_PROCESS="xmrig"


INTERVAL=5

while true; do
    PIDS=$(pgrep -f "$TARGET_PROCESS")
    
    for pid in $PIDS; do
        if [ -d "/proc/$pid" ]; then
            CUR_NICE=$(ps -o ni= -p $pid)
            
            if [ "$CUR_NICE" -ne -20 ]; then
                renice -n -20 -p $pid >/dev/null 2>&1
                echo "$(date): Set PID $pid ($TARGET_PROCESS) nice=-20"
            fi
        fi
    done
    
    sleep $INTERVAL
done