The start-up kernel messages in the Linux system comes like a burst and it is difficult to analyze those messages while the system boots up. However, after the operating system is loaded, you can view those messages with ‘dmesg’ command. This command will display the messages of the last time boot. Check the command as follows:
The ‘less’ command after the pipe will display the file in the window with easy scroll both up and downwards. This is just opposite to ‘more’ where you cannot scroll. Sample of the command output is shown below:
Please note that ‘dmesg’ will only show the status of the modules when they are initialized, however, if you want to view the configuration and status data of that particular module, you still need to view ‘/var/log/messages’ file. When debugging the system startup problems, you’ll have to view both ‘dmesg’ and ‘/var/log/messages’.
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