Old Kernels Cleaning

#!/bin/bash

# Restart script as root
if [ $UID -ne 0 -a "$SIMULATE" = "FAUX" ]
then
    sudo $0 "$@"
    #su - -c '$0 "$@"'
    exit 0
fi

# Number of kernels to keep
KEEP=2
# List installed kernels
KERNELS=($(dpkg -l | awk '/ii  linux-image-[0-9]\./{gsub("-generic","",$2); print $2}'))
# Delete the two last kernels (if KEEP=2) from the list
KERNELS_TO_REMOVE=(${KERNELS[@]:0:${#KERNELS[@]}-$KEEP})

# Remove listed kernels
apt-get purge ${KERNELS_TO_REMOVE[@]} ${KERNELS_TO_REMOVE[@]/image/headers}