bash script template

bash_template

#!/bin/bash

PROGNAME=`basename $0`
CRIT=15
WARN=30

usage() {
  echo "$PROGNAME -H <FQDN> [-c <15>] [-w <30>]"
  echo "-H Mandatory, please put the fully qualified domain name for the SSL Certificate you want to monitor"
  echo "-c Default 15, the number of days left before it alerts for Critical state"
  echo "-w Default 30, the number of days left before it alerts for Warning state"
  exit
}

while getopts :h:c:w: OPTION
do
  case $OPTION in
    h)
      HOST=${OPTARG}
      ;;
    c)
      CRIT=${OPTARG}
      ;;
    w)
      WARN=${OPTARG}
      ;;
    *)
      usage
      ;;
  esac
done

if [[ -z ${HOST} ]]; then
  usage
fi