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jobs

How do I display information from /proc such as memory, Load average, uptime, page activity, context, disk status, interrupts using a shell or perl script?
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How do I kill all the UNIX jobs I created under my current login shell such as Bash or KSH before logout?
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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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