In newer versions of Oracle Database it is not obvious where is the location of the alert file to investigate any potential issues.
The best way to find the Oracle alert file location is to use this query
where NAME = 'Diag Trace';
Sometimes I need to check all my virtual hosts on my Apache server.
The best way to do it is with a cat command like this
/var/log/apache2# cat *.access.log
If I want to keep observing the log I use the command tail as follows
/var/log/apache2# tail -f *.access.log
But if I want to check something more specific I can use a grep too
/var/log/apache2# cat *.access.log | grep root
This is a quick way to verify my logs without having to check them one by one.