用grep Print all lines containing an uppercase letter, followed by four lowercase letters, a comma, a , and one uppercase letter.

Sure, you can use the following command to grep for the specified pattern:

grep -E '[A-Z][a-z]{4},[a-z],[A-Z]' <filename>

This will print all lines in <filename> that contain an uppercase letter, followed by four lowercase letters, a comma, a lowercase letter, and finally an uppercase letter.