#!/bin/bash
# Possible summaries include:
# No packages needed for security; %d packages available
# %d package(s) needed[ (+%d related)] for security, out of %d available
# There are [[%d security update(s)[ out of ]%d total update(s)]] available
LANG=C /usr/bin/yum \
    --debuglevel 2 \
    --security check-update 2>/dev/null \
        | grep -P '(?<! 0 packages) available$' \
    && echo 'Run "sudo yum update" to apply all updates.'