Not able to solve these questions plzz help

1.Display a list of /usr/share/doc subdirectories containing information about shells.How many README files do these subdirectories contain? Don't count anything in the form of "README.a_string".
2.Make a list of files in your home directory that were changed less that 10 hours ago, using grep, but leave out directories.

Hi,

Answer of your second question.

find dir_name -name "*.*" -mmin -600 -print | awk -F'/' '{print $NF'}

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