A sample Upstart and System.d script

custom.service

[Unit]
Description=Custom Start Up Service

[Service]
ExecStartPre=/bin/mkdir -p /var/log/customprocess
ExecStartPre=/bin/touch /var/log/customprocess/custom.log
ExecStart=/var/custom_service/our_service.sh

[Install]
WantedBy=multi-user.target

custom_service.conf

description "Custom Start up"

start on runlevel [2345]
stop on runlevel [!2345]

pre-start script
  mkdir -p /var/log/customprocess
  touch /var/log/customprocess/cusom.log
end script

script
  echo `date` >> /var/log/customprocess/custom.log
end script

gistfile1.txt

[Unit]
Description=Custom Start Up Service

[Service]
ExecStartPre=/bin/mkdir -p /var/log/customprocess
ExecStartPre=/bin/touch /var/log/customprocess/custom.log
ExecStart=/var/custom_service/our_service.sh

[Install]
WantedBy=multi-user.target

our_service.sh

#!/bin/bash

date >> /var/log/customprocess/custom.log;

sleep 3h;