Linux Update Script

#!/bin/bash
set -euo pipefail

# Detect distribution
if [ -f /etc/os-release ]; then
    . /etc/os-release
    DISTRO="$ID"
else
    echo "Cannot detect distribution. /etc/os-release not found."
    exit 1
fi

echo "Detected distribution: $DISTRO"
echo "Starting system update..."

case "$DISTRO" in
    debian|ubuntu)
        apt update
        apt upgrade -y
        apt autoremove -y
        apt autoclean
        ;;
    almalinux|rocky|centos|rhel|cloudlinux|fedora)
        if command -v dnf &>/dev/null; then
            dnf upgrade -y
            dnf autoremove -y
            dnf clean all
        else
            yum update -y
            yum autoremove -y
            yum clean all
        fi
        ;;
    arch|manjaro)
        pacman -Syu --noconfirm
        # Remove orphaned packages
        ORPHANS=$(pacman -Qdtq 2>/dev/null) || true
        if [ -n "$ORPHANS" ]; then
            pacman -Rns --noconfirm $ORPHANS
        fi
        ;;
    opensuse*|sles)
        zypper refresh
        zypper update -y
        zypper clean --all
        ;;
    alpine)
        apk update
        apk upgrade
        # Remove cached packages
        apk cache clean 2>/dev/null || rm -rf /var/cache/apk/*
        ;;
    *)
        echo "Unsupported distribution: $DISTRO"
        exit 1
        ;;
esac

echo "Update complete."

# Show if a reboot is required (Debian/Ubuntu)
if [ -f /var/run/reboot-required ]; then
    echo "*** A reboot is required to apply kernel updates. ***"
fi

# Show if a reboot is required (RHEL-family)
if command -v needs-restarting &>/dev/null; then
    if needs-restarting -r &>/dev/null; then
        true
    else
        echo "*** A reboot is required to apply kernel updates. ***"
    fi
fi