KSystemLog provides an easy way to control the reading and the monitoring of log files. Indeed, sometimes you only need to analyze some existing log lines. In this case, you cannot tolerate the appearance of a new line. You can deactivate the monitoring of log files by clicking on the button. This stops the opened log files from being updated while still letting them get filled by other processes. Of course, you can reactivate the monitoring by clicking on , which will display the log lines added since the last pause.
Furthermore, to focus on the newly appeared log lines, you can toggle the option.