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Just a simple little post of an image that I have found very handy over the years. Taught me all about how to use VI when I first started using Linux. Here is the full size version: VI Cheat Sheet Full Size  
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What Is Crontab ? A crontab is a simple text file that holds a list of commands that are to be run at specified times. These commands, and their related run times, are controlled by the cron daemon and are executed in the system’s background. More information can be found by viewing the crontab’s man page. We will run through a simple crontab example later. How Does It Work ? The system maintains a crontab for each user on the system. In order to edit or create a crontab, you must use the text editor that is specified by your system. The vi text editor is the default text editor on a Mandrake 10.0 Official system. This text editor must be opened with the command crontab using the -e option. To create a crontab open a term and type: crontab -e The vi text editor will open with a blank window
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