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The process of using recursive grep to search through all directories and subdirectories involves using the following command:

grep -r <search term> <directory>

Where:

• -r is the recursive flag that tells grep to search through all directories and subdirectories
• <search term> is the term that you want to search for
• <directory> is the directory where you want to start the search

For example, if you want to search for the term "apple" in the directory /home/user/documents/, the command would be:

grep -r apple /home/user/documents/

This command will search for the term "apple" in all files within the /home/user/documents/ directory and its subdirectories.