docker_service_logs.sh

#!/bin/bash
# external variable sources
  source /opt/docker/scripts/.color_codes.conf
  source /opt/docker/scripts/.vars_docker.env

# function definitions
  fnc_help(){
    echo -e "${blu:?}[-> This script lists logs for the indicated '${cyn:?}stackname_${cyn:?}servicename${blu:?}' <-]${def:?} "
    echo -e " -"
    echo -e " - SYNTAX: # dvl ${cyn:?}-option${def:?}"
    echo -e " -   VALID OPTION(S):"
    echo -e " -     ${cyn:?}-h │ --help ${def:?}| Displays this help message."
    echo -e " -"
    echo -e " - SYNTAX: # dvl ${cyn:?}appname${def:?}"
    echo -e " - SYNTAX: # dvl ${cyn:?}appname${def:?} ${cyn:?}-option${def:?}"
    echo -e " -   VALID OPTION(S):"
    echo -e " -     ${cyn:?}-l │ --long ${def:?}| Displays '${cyn:?}docker service ps --no-trunk ${cyn:?}appname${def:?}' output with non-truncated entries."
    echo
    echo -e " -   NOTE: ${cyn:?}appname${def:?} MUST consist of '${cyn:?}stackname_${cyn:?}servicename${def:?}' as defined in the .yml file. ex: 'traefik_app' or 'traefik_whoami'"
    echo
    exit 1 # Exit script after printing help
    }
  fnc_invalid_syntax(){ echo -e "${ylw:?} >> INVALID OPTION SYNTAX, USE THE -${cyn:?}help${ylw:?} OPTION TO DISPLAY PROPER SYNTAX <<${def:?}"; exit 1; }
  fnc_service_logs(){ docker service logs "${1}"; }
  fnc_service_logs_long(){ docker service logs --no-trunc "${1}"; }

# determine script output according to option entered
  case "${1}" in
    ("") fnc_invalid_syntax ;;
    (-*)
      case "${1}" in
        ("-h"|"-help"|"--help") fnc_help ;;
        (*) fnc_invalid_syntax ;;
      esac
    ;;
    (*)
      case "${2}" in
        ("-l"|"--long") fnc_service_logs_long "{$1}" ;;
        (*) fnc_service_logs "${1}" ;;
      esac
    ;;
  esac