gistfile1.txt

#!/bin/bash
set -e

case "$1" in
    configure)
        # logic common to all installs/upgrades
        # if $2 is set, this is an upgrade
        if ( [ -n "$2" ] && [ "$RESTART_ON_UPGRADE" = "true" ] ) ; then
          # restart a service
        fi
        ;;

    triggered)
        # logic when this script is triggered by another package install
        # maybe a binary has changed?
        if ( [ -n "$2" ] == “redis-binary-upgrade”) ; then
          # restart a service
        fi
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
	# handle package installation failure
    ;;

    *)
        echo "$APP_NAME $0 called with unknown argument '$1'" >&2
        exit 1
    ;;
esac