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/var/log/messages

How do I verify or check cronjob is running or not under a CentOS / RHEL / Fedora Linux from a shell prompt?
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I am a new Linux user. I would like to know where are the log files located under Debian/Ubuntu or CentOS/RHEL/Fedora Linux server? How do I open or view log files on Linux operating systems?
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How Can I Log In As root User?

sudo command demo

How do I log in as root user under Linux, Apple OS X, *BSD, and UNIX-like operating systems?
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