How to find all files containing specific text or a string on Linux?

 To find all files containing specific text or a string on Linux, you can use the grep command. Here are the steps:

1. Open a terminal window.

2. Type grep followed by a space, the text or string that you want to search for enclosed in quotes, and a space.

3. Type an asterisk * followed by a dot . and the file extension that you want to search in. For example, to search for the string "example" in all text files in the current directory and its subdirectories, type:

perl
grep "example" *.txt

or

bash
grep "example" *.log

Note that the * and . are used to match all files with the specified extension.

4. Press Enter.

5. The terminal will display a list of all files that contain the specified string, along with the line number and the matching text.

6. If you want to search for the string in all files in the current directory and its subdirectories, you can use the -r option with the grep command. For example, to search for the string "example" in all files in the current directory and its subdirectories, type:

perl
grep -r "example" .

7. This will search for the string in all files in the current directory and its subdirectories recursively.

Note that Linux is case sensitive, so make sure that you type the search string exactly as it appears, including any capitalization or punctuation. Also, the grep command is most useful for searching for text in text files. For searching in binary files or more complex search operations, other commands or tools may be more appropriate.