Finding a File containing a particular text string in Linux server

For example search for a string called redeem reward in all text files located in /home/tom/*.txt directory, use

$ grep "redeem reward" /home/tom/*.txt

You can search for a text string all files under each directory, recursively with -roption:

$ grep -r "redeem reward" /home/tom

By default, grep command prints the matching lines You can pass -H option to print the filename for each match.

$ grep -H -r "redeem reward" /home/tom