Cacher is the code snippet organizer for pro developers

http://crontab-generator.org/
http://www.cyberciti.biz/faq/linux-show-what-cron-jobs-are-setup/
https://help.ubuntu.com/community/CronHowto
https://en.wikipedia.org/wiki/Cron
https://help.1and1.com/hosting-c37630/scripts-and-programming-languages-c85099/cron-jobs-c37727/delete-a-cron-job-a757264.html

http://www.systutorials.com/1760/linux-setting-date-time-and-timezone/

http://stackoverflow.com/questions/226703/how-do-i-prompt-for-input-in-a-linux-shell-script
http://stackoverflow.com/questions/8352851/how-to-call-shell-script-from-another-shell-script
http://stackoverflow.com/questions/233217/how-to-pass-the-password-to-su-sudo-ssh-without-overriding-the-tty
http://tecadmin.net/if-then-else-elif-in-bash-shell-scripting/
http://stackoverflow.com/questions/20162678/linux-script-to-check-if-process-is-running-act-on-the-result