What is the difference between find with grep?

Question

What is the difference between these command:

find . –type f –name \'*txt*\' 

and

find . –type f | grep \'txt\'

Answer 1

In your first example, you are using the find utility to list the filenames of regular files where the filename includes the string txt.

In your second example, you are using the findutility to list the filenames of regular files and feeding the resultant filenames via a pipe to the grep utility which searches the contents of each file for the string txt. Each time the string is found, the corresponding line of the file is outputted.