crontab command

How do I remove a user’s access from my server? How do I delete a user account under Linux operating systems?

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How do I install vnStat under FreeBSD 8 operating system to keep track of my network traffic?

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The cron and at services are used to allow commands to be executed at a later time. How do I restrict them to selected users such as root, opt1, opt2 and so on? How do I make sure user php can run php script but cannot modify or install a new job?

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How do I view currently setup or all running cron jobs under Linux operating systems?

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I am on Red Hat Enterprise Linux 5.x server. Is there is an easy way to run script or command at boot time after fresh reboot command?

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Q. I’d like to send email to user@example.com instead of default root user. How do I change email settings under crontab file?
Q. I’d like to send email to user@example.com instead of default root user. How do I change email settings under crontab file?

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I login to my UNIX system as a normal user. However, I need to update my cronjob entry. But, I can’t find where the crontab file is. How do I find out my crontab file location?

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