Apache and other services generate logs, that can increase the size rapidly, and could take gigabytes of the hard drive.
View Log with tail
Let’s supose you want to view the log located at /usr/local/apache/logs/mylog.log
It will show the last lines of the log, you can also tell the command to show more lines.
echo “” > /usr/local/apache/logs/mylog.log
It will replace the content of the file for an empty string.