display-services.sh

#!/bin/bash
# This was created to be used as a service overview in the motd on a Debian system.
# But use it as you like.

# Add service names in this array
services=( "videoserver" "hostapd" "isc-dhcp-server" )

echo " "
echo "SERVICES"

join() {
  # $1 is return variable name
  # $2 is sep
  # $3... are the elements to join
  local retname=$1 sep=$2 ret=$3
  shift 3 || shift $(($#))
  printf -v "$retname" "%s" "$ret${@/#/$sep}"
}

servicesStatus=()
maxChar=0

for service in "${services[@]}"
do
  if [ "${#service}" -gt "$maxChar" ]; then
    maxChar="${#service}"
  fi
done


for service in "${services[@]}"
do
  status="$(/bin/systemctl is-active $service)"
  servicesStatus+=("$status")

  spaces=()

  for i in $(seq ${#service} $maxChar);
  do
    spaces+=("\x20")
  done
  join spacesJoined "" ${spaces[*]}

  printf "$service:$spacesJoined[ $status ]\n"
done