find . -name "*.txt" searches for all files with the extension .txt in the current directory and its subdirectories.find /var/log -type f -size +10M -print searches for files larger than 10MB in the /var/log directory.find /usr/local -type f -mtime +30 -print searches for files modified within the last 30 days in the /usr/local directory.find /home -type d -name "*test*" searches for all directories with names containing "test" in the /home directory.find /etc -type f -exec grep "example.com" {} \\; searches for all lines in files located in the /etc directory that contain the string "example.com".