How to view logs under Linux in real time

Linux log files in the/var/log directory, you can view the log files by command.
    1,cat messages can view a log file.
    2, to achieve real-time updates, you can view the updated data through the tail command, such as TAIL-F messages.
    3,tail Command parameters:
    -F Loop Read
    -Q does not display processing information
    -V displays detailed processing information
    Number of-c< > bytes displayed
    -n< lines > Display rows
    
    
    -S,--sleep-interval=s and-F are combined to indicate the sleep s seconds at each repetition interval.

How to view logs under Linux in real time