Checking invalid SSH attempts

Running the following will gives the unique count of invalid SSH attempts on Linux server.

sudo awk 'gsub(".*sshd.*Failed password for (invalid user )?", "") {print $1}' /var/log/secure | sort | uniq -c | sort -rn | head -10

Or all of the /var/log/secure* files

sudo awk 'gsub(".*sshd.*Failed password for (invalid user )?", "") {print $1}' /var/log/secure* | sort | uniq -c | sort -rn | head -10