Cron jobs are scheduled tasks, that are executed on regular time intervals pre-set by the user and they also execute scripts developed in different programming languages - PHP, Perl, Bash, and so on. Determined by what exactly a cron should do, it may run every single minute, every week or even each year. There are numerous handy applications to make use of cron jobs in the daily administration of a website. For example, a backup copy of the full website can be generated once per day or perhaps once per week or an e-mail message with all new signups for the day can be delivered to a given e-mail. This kind of automated options can make the administration of any site much easier. There are no specific file types which are allowed / forbidden, so any script can be run employing a cron job.