test.sh

#!/usr/bin/env bash

output=""
l_tsd=""
l_sdtd=""
chrony=""
l_ntp=""
dpkg-query -W chrony >/dev/null 2>&1 && l_chrony="y" dpkg-query -W ntp >/dev/null 2>&1 && l_ntp="y" || l_ntp="" systemctl list-units --all --type=service | grep -q 'systemd-timesyncd.service' && systemctl is-enabled systemd-timesyncd.service | grep -q 'enabled' && l_sdtd="y"
# ! systemctl is-enabled systemd-timesyncd.service | grep -q 'enabled' && l_nsdtd="y" || l_nsdtd=""
if [[ "$l_chrony" = "y" && "$l_ntp" != "y" && "$l_sdtd" != "y" ]]; then
    l_tsd="chrony"
    output="$output\n- chrony is in use on the system"
elif [[ "$l_chrony" != "y" && "$l_ntp" = "y" && "$l_sdtd" != "y" ]]; then
    l_tsd="ntp"
    output="$output\n- ntp is in use on the system"
elif [[ "$l_chrony" != "y" && "$l_ntp" != "y" ]]; then
    if systemctl list-units --all --type=service | grep -q 'systemd- timesyncd.service' && systemctl is-enabled systemd-timesyncd.service | grep -Eq '(enabled|disabled|masked)'; then
        l_tsd="sdtd"
        output="$output\n- systemd-timesyncd is in use on the system"
    fi
else
    [[ "$l_chrony" = "y" && "$l_ntp" = "y" ]] && output="$output\n- both chrony and ntp are in use on the system"
    [[ "$l_chrony" = "y" && "$l_sdtd" = "y" ]] && output="$output\n- both chrony and systemd-timesyncd are in use on the system"
    [[ "$l_ntp" = "y" && "$l_sdtd" = "y" ]] && output="$output\n- both ntp and systemd-timesyncd are in use on the system"
fi
if [ -n "$l_tsd" ]; then
    echo -e "\n- PASS:\n$output\n"
else
    echo -e "\n- FAIL:\n$output\n"
fi