This question already has an answer here:
As far as I know,
tail -f <filename> allows to continuously print newly appended data from one single file.
What if I need to get content from multiple files located in multiple folders under the same parent folder, then filter that content if need be, and finally print it as a real-time stream, as new data gets appended to any one of the multiple monitored files?
EDIT: the operating system is RedHat Enterprise Linux 7.4