Nagios plugin to check if a machine has packages that apt can autoremove

check_apt_autoremove

#!/bin/bash

# Nagios plugin to check if a machine has packages that apt can autoremove
# Author: John Slade (http://jtes.net)

AUTOREM_OUTPUT=$(apt-get --dry-run autoremove)
TO_REMOVE=$(echo $AUTOREM_OUTPUT | perl -pe 's/^.*?, (\d*) to remove.*$/$1 to remove/g')

if echo $AUTOREM_OUTPUT | grep -q "0 to remove"; then
        # no pacakges to remove (0=OK)
        echo "OK: no reboot required"
        exit 0
else
        # some packages to remove (1=WARN)
        echo "WARNING: $TO_REMOVE"
        exit 1
fi