find -atime +3 -name targz

This command will find all files in the current directory and its subdirectories that have not been accessed in the last 3 days and have the extension ".tar.gz".

Explanation:

• "find" command is used to search for files and directories in a specified location.
• "-atime +3" option is used to search for files that have not been accessed in the last 3 days. "+3" means more than 3 days.
• "-name" option is used to specify the name of the file to search for.
• ".tar.gz" is the name of the file to search for, with the extension ".tar.gz". The dot before the file name means that it is a hidden file