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crontab command

Linux: Delete / Remove User Account

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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Linux: List / Display All Cron Jobs

How do I view currently setup or all running cron jobs under a Linux or Unix-like operating systems?
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Linux Execute Cron Job After System Reboot

I am on Red Hat Enterprise Linux server. Is there is an easy way to run script or command at boot time after fresh reboot command?
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Linux / UNIX: Change Crontab Email Settings ( MAILTO )

I would like to send an email to user@example.com instead of default system root user for crond service on a Linux or Unix-like system. How do I change the email settings under crontab file on a Linux or Unix-like systems?
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Linux / UNIX Crontab File Location

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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