Example of a command to view the log file in real time:
tail -f /var/log/syslog
The output of the data can be highlighted in different colors, for this you can set ccze:
sudo apt-get install ccze
And for example, to formulate a command as follows:
tail -f /var/log/syslog | ccze --mode ansi
To stop viewing, you can use the keyboard shortcut Ctrl + C.