check if currently running kernel version matches the installed linux package version

kernel_versions.sh

#!/bin/bash

function currently_installed_kernel() {
  yaourt -Qi linux | egrep '^Version\s+:\s+.+$' | sed -e 's/Version\s\+:\s\+//'
}

function currently_running_kernel() {
  uname -a | grep -P '\S+(?=-ARCH)' -o
}

installed=$(currently_installed_kernel)
running=$(currently_running_kernel)

if [ "$running" == "$installed" ]; then
  echo "Running kernel version matches installed linux package version"
  exit 0
else
  echo "Running kernel version differs from installed linux package version"
  exit 1
fi