Bash script to compress a folder with screen

compress_folder.sh

#!/usr/bin/env bash
# using template from:  https://betterdev.blog/minimal-safe-bash-script-template/
set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF 
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f || --folder_name] "a folder name" 
       [-s || --source_dir] "/source/" [-d || --destination_dir] "/destination/" arg1 [arg2...]

Script description here.

Available options:

-h, --help              Print this help and exit
-v, --verbose           Print script debug info
-f, --folder_name       Folder Name (source sub-folder's name)
-s, --source_dir        Source Directory
-d, --destination_dir   Destination Directory
EOF
  exit
}

cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
  # script cleanup here
}

setup_colors() {
  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
  else
    NOFORMAT='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
  fi
}

msg() {
  echo >&2 -e "${1-}"
}

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

parse_params() {
  # default values of variables set from params
  flag=0
  param=''

  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --verbose) set -x ;;
    --no-color) NO_COLOR=1 ;;
    -f | --folder_name) 
      folder_name="${2-}"
      shift
      ;;
    -s | --source_dir) 
      source_dir="${2-}"
      shift
      ;;
    -d | --destination_dir) # example named parameter
      destination_dir="${2-}"
      shift
      ;;
    -?*) die "Unknown option: $1" ;;
    *) break ;;
    esac
    shift
  done

  args=("$@")

  # check required params and arguments
  [[ -z "${folder_name-}" ]] && die "Missing required parameter: folder_name"
  [[ -z "${source_dir-}" ]] && die "Missing required parameter: source_dir"
  [[ -z "${destination_dir-}" ]] && die "Missing required parameter: destination_dir"

  # NO ADDITIONAL SCRIPT ARGUMENTS ->
  #[[ ${#args[@]} -eq 0 ]] && die "Missing script arguments"

  return 0
}

parse_params "$@"
setup_colors

############################
# script logic starts here #
############################
screen -mdS "${folder_name}"
sleep 0.1

echo "Stuffing: tar -czvf ${destination_dir}/${folder_name}.tar.gz ${source_dir}/${folder_name}/\r"
screen -S "${folder_name}" -X stuff "tar -czvf ${destination_dir}/${folder_name}.tar.gz ${source_dir}/${folder_name}/\r"
####################
# end script logic #
####################

msg "${RED}Read parameters:${NOFORMAT}"
msg "- flag: ${flag}"
msg "- param: ${param}"
msg "- arguments: ${args[*]-}"

bash script to use screen in a terminal to kick off a backup of a specific folder to a file named the same as the folder.

./compress_folder.sh -f "Folder_001" -s "/media/seakin/256External/" -d "/media/seakin/123GbThumb"
./compress_folder.sh -f "Folder_002" -s "/media/seakin/256External/" -d "/media/seakin/123GbThumb"

creates files "/media/seakin/123GbThumb.Folder_001.tar.gz" and "/media/seakin/123GbThumb.Folder_002.tar.gz" from "/media/seakin/256External/Folder_001" and "/media/seakin/256External/Folder_002"