getopts template

getopts.sh

if [[ ! ${*} =~ ^\-.+ ]]; then
  help-function
fi

while getopts "chd" opt; do
  case $opt in
  c)
    c-function
    exit 0
    ;;
  h)
    h-function
    exit 0
    ;;
  d)
    d-function
    exit 0
    ;;
  ?)
    help-function
    exit 1
    ;;
  esac
done