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The command that can be used to view system logs is journalctl. This tool is specifically designed for querying and displaying logs from the systemd journal, which is a central logging system used in many modern Linux distributions, including RHEL. The advantage of journalctl is that it allows users to filter, search, and format log entries based on various criteria, such as time, service, and priority level, making it a powerful utility for analyzing system behavior and troubleshooting issues.

While the command cat /var/log/messages can display certain system log entries from the traditional logging files in the /var/log directory, it does not provide the advanced features and filtering options available with journalctl. The other options, logview and viewlogs, are not standard or recognized commands in RHEL for viewing logs. Therefore, usage of journalctl is recommended for most log viewing tasks in a systemd-based environment.