The command is,
grep -H -r "<the text string>" <directory path>
-H tells it to print the file name when a match is found.
-r or -R tells it to do it recursively.
For example, if you want to find all the files containing the text "master piece" in the /usr/doc directory and its subdirectories, the command would be this.
grep -H -r "master piece" /usr/doc
If you are interested in finding only a certain type of files containing the text, for instance, all the txt files, you can use the command below to achieve it.
grep -H -r "master piece" /usr/doc | grep .txt
grep -H -r "<the text string>" <directory path>
-H tells it to print the file name when a match is found.
-r or -R tells it to do it recursively.
For example, if you want to find all the files containing the text "master piece" in the /usr/doc directory and its subdirectories, the command would be this.
grep -H -r "master piece" /usr/doc
If you are interested in finding only a certain type of files containing the text, for instance, all the txt files, you can use the command below to achieve it.
grep -H -r "master piece" /usr/doc | grep .txt
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