Search for a string in multiple files

grep is a common command used on unix for searching. This is a very useful tool and provides powerful options. One such option is to search for a string in multiple files in the current directory and sub directories. The command is :

grep -rl "search string" /usr

-r stands for search recursively in current directory and sub directory.
-l suppress the display of additional information and just outputs the file names.
/usr refers to root folder under which the search happens.

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