40-services

#!/bin/bash
# This script displays the status of a list of specified services
# Base version used for this script: https://github.com/yboetz/motd/blob/master/40-services


# set column width
COLUMNS=3
# colors
green="\e[1;32m"
red="\e[1;31m"
undim="\e[0m"

services=("fail2ban" "ufw" "docker" "apache2")
# sort services
IFS=$'\n' services=($(sort <<<"${services[*]}"))
unset IFS

service_status=()
# get status of all services
for service in "${services[@]}"; do
    service_status+=($(systemctl is-active "$service"))
done

out=""
for i in "${!services[@]}"; do
    # color green if service is active, else red
    if [[ "${service_status[$i]}" == "active" ]]; then
        out+="${services[$i]}:,${green}${service_status[$i]}${undim},"
    else
        out+="${services[$i]}:,${red}${service_status[$i]}${undim},"
    fi
    # insert \n every $COLUMNS column
    if [ $(((i+1) % COLUMNS)) -eq 0 ]; then
        out+="\n"
    fi
done
out+="\n"

printf "\nservices:\n"
printf "$out" | column -ts $',' | sed -e 's/^/  /'