Which statement about the 'dmesg' command is true?

The 'dmesg' command is primarily used to display messages from the kernel's ring buffer. This ring buffer contains log messages produced by the kernel, including information about hardware events, driver initializations, and various system states that occur during the boot process and while the system is running. By using this command, users can gain insight into what the kernel is doing and any issues that may arise, making it a valuable tool for system diagnostics and troubleshooting.

While the 'dmesg' command may indirectly provide information about errors or events related to user applications, it does not specifically log those errors. Instead, it focuses on kernel-level messaging. It also does not show real-time network traffic or track system shutdowns directly. Those functions are typically associated with different tools and log files in the Linux environment.