Simple bash program for disabling some cpu cores

cores.sh

#!/bin/bash

# USING
# chmod +x cores.sh
# ./cores.sh x
# where x is a number of cores you want to have active, all others will be disabled

# CONFIG

coresCount=16 # write your number of cores (threads)

# PROGRAM

let endCore=$coresCount-1

if [ $1 -lt 1 ]
then
  echo "At least one core must be active"
  exit 0
fi

let range=$1-1

for x in $(eval echo {1..$range})
do
  echo 1 > "/sys/devices/system/cpu/cpu$x/online"
done

if [ $1 -gt $endCore ]
then
  echo "All enabled"
  exit 0
fi

for x in $(eval echo {$1..$endCore})
do
  echo 0 > "/sys/devices/system/cpu/cpu$x/online"
done