rm_old_kernels

#!/bin/bash

# Ubuntu kernel cleanup:
# Save the 2 latest kernels and remove the old

IMAGES=($(dpkg --get-selections | grep "linux-image-[[:digit:]].*" | tr "\t" ";" | cut -d ";" -f1))
HEADERS=($(dpkg --get-selections | grep "linux-headers-[[:digit:]].*" | tr "\t" ";" | cut -d ";" -f1))
I_LEN=${#IMAGES[@]}
H_LEN=${#HEADERS[@]}

if [ $I_LEN>2 ] ; then
  for (( i=0; i<(${I_LEN}-2); i++ )) ; do
    sudo apt-get purge ${IMAGES[$i]}
  done
  sudo apt-get autoclean && sudo apt-get autoremove
fi

if [ $H_LEN>2 ] ; then
  for (( i=0; i<(${H_LEN}-2); i++ )) ; do
    sudo apt-get purge ${HEADERS[$i]}
  done
  sudo apt-get autoclean && sudo apt-get autoremove
fi