Question: Bash: using grep only: Display configuration files in /etc that contain numbers in their names. Display localhost information from the /etc/hosts file, display the line

Bash: using grep only:

Display configuration files in /etc that contain numbers in their names.

Display localhost information from the /etc/hosts file, display the line number(s) matching the search string and count the number of occurrences of the string.

Can you find an alternative for wc -l, using grep?

Display a list of all the users on your system who log in with the Bash shell as a default.

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".

Make a list of files in your home directory that were changed less that 10 hours ago, using grep, but leave out directories.

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