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  • What is 'Cron Jobs'?

    I have seen this all over the place but what exactly is it and what does it do? Thanks in advance.

  • #2
    well you can compare cron jobs with task scheduling,

    Its like you can have some task's scheduled to be done automatically, people use it to ceate backup of website or perform general cleanup sort of tasks.
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    • #3
      Originally posted by anantshri
      well you can compare cron jobs with task scheduling,
      Its like you can have some task's scheduled to be done automatically, people use it to ceate backup of website or perform general cleanup sort of tasks.
      Do you know how to do backup with cron job ? If you know can you explain how to do it ? I think thats one of the best use we can get from cron jobs.

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      • #4
        You would need a script (either a shell script or PHP) that does the necessary copying of files. It is this script that would be put into the cron task. You might want to check out hotscripts.com, as they have backup management type scripts that would serve your purpose.

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        • #5
          Cron jobs is to schedule a task for the server to do. PHP can schedule cron jobs to work, just places like hotscripts will fix you up.

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          • #6
            thanks for the site infor brandon, till now i used only shell to create cron jobs, but this will of great help to me.
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            • #7
              The cron daemon is a long running process that executes commands at specific dates and times. To schedule one-time only tasks with cron, use at or batch. For commands that need to be executed repeatedly (e.g. hourly, daily or weekly), use crontab, which has the following options:
              crontab filename Install filename as your crontab file.
              crontab -e Edit your crontab file.
              crontab -l Show your crontab file.
              crontab -r Remove your crontab file.

              The crontab command creates a crontab file containing commands and how often cron should execute them. Each entry in a crontab file consists of six fields, specified in the following order:

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              • #8
                Cron is the name of program that enables unix users to execute commands or
                scripts (groups of commands) automatically at a specified time/date. It is
                normally used for sys admin commands, like makewhatis, which builds a
                search database for the man -k command, or for running a backup script,
                but can be used for anything. A common use for it today is connecting to
                the internet and downloading your email.
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                • #9
                  Cron job is a Linux command for scheduling a task to be executed sometime in the future.
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                  • #10
                    Cron jobs are scheduled tasks that the system runs at predefined times or intervals
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                    • #11
                      Cron jobs, created utilizing the command line program referred to as crontab, require that your web site be hosted on a Unix-sort internet server, equivalent to Linux
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                      • #12
                        The software utility Cron is a time-based job scheduler in Unix-like computer operating systems. People who set up and maintain software environments use cron to schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or intervals.
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                        • #13
                          Thanks for sharing information.........

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                          • #14
                            What Is a Cron Job?

                            cron is a Linux utility which schedules a command or script on your server to run automatically at a specified time and date. A cron job is the scheduled task itself. Cron jobs can be very useful to automate repetitive tasks.
                            For example, you can set a cron job to delete temporary files every week to conserve your disk space. Some programs, such as Drupal, may even require you to set up a cron job to perform certain functions.
                            Scripts executed as a cron job are typically used to modify files or databases. However, they can perform other tasks that do not modify data on the server, like sending out email notifications.
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                            • #15
                              Scripts executed as a cron job are typically used to modify files or databases. However, they can perform other tasks that do not modify data on the server, like

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