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A system administrator is trying to troubleshoot a problem with a Linux system. They need to see the kernel log. Which of the following commands can be used to do this?0.5 Markscat /var/log/messages journalctldmesgtail -f /var/log/syslog

Question

A system administrator is trying to troubleshoot a problem with a Linux system. They need to see the kernel log. Which of the following commands can be used to do this?0.5 Markscat /var/log/messages journalctldmesgtail -f /var/log/syslog

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Solution

The system administrator can use the following commands to view the kernel log in a Linux system:

  1. dmesg: This command is used to print or control the kernel ring buffer. It allows you to view the messages related to the working of hardware and also the messages output by the kernel.

  2. journalctl: This command is used to query the contents of the systemd journal. Systemd journal contains messages from kernel as well as the userland.

  3. cat /var/log/messages: This command is used to view the system's message log. However, this may not be available on all Linux distributions.

  4. tail -f /var/log/syslog: This command is used to view the contents of syslog, which is a standard logging facility. It contains more than just kernel messages. The -f option is used to follow the content of the file in real time.

So, all of these commands can be used to view the kernel log, but the output and the details might vary.

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