You can find content inside a file by using Linux grep command.
eg : If you want to find the usage of text called "Hello". You can type as
follows:
grep -r hello .-r option means read all files under each directory, recursively
hello - means the content what you want to search
. - means the path for this scenario it means from current folder.(You can use absolute path as well eg: /home/gayan/)
Enjoy ~
