killcputop.sh

#!/bin/bash

# Shell-script that kills top of cpu-usage process (with minimal load limit)
# Dependencies: ps awk bc (available by-default at mostly linux distro)

# Minimal process CPU load after that process will be killed
MIN_CPU_LOAD="50"
echo "Min cpu load to kill $MIN_CPU_LOAD %"

pid=$(ps -eo %cpu,pid,comm --sort -%cpu --no-headers | head -n 1)
# For debugging purposes 
# echo $pid

if [[ -n $pid ]]; then
    # Maybe use single command to fill array or object-like storage
    kcpu=$(echo "$pid" | awk '{print $1}')
    kpid=$(echo "$pid" | awk '{print $2}')
    command=$(echo "$pid" | awk '{print $3}')

    # Workaround to compare float numbers
    ift=$(echo "$kcpu"'>'"$MIN_CPU_LOAD" | bc -l)
    if [ "$ift" -eq "1" ]; then
        echo "Process $command (pid: $kpid) is high cpu usage $kcpu % greater than $MIN_CPU_LOAD. Killing"
        kill "$kpid"
    else
       echo "Process $command (pid: $kpid) is low cpu usage $kcpu %."
    fi
else
echo "Does not exist"
fi