Task: Remove all files a.out and *.o in the /system directory tree that were modified less than 7 days ago
Command: find /system \( -name a.out -o -name '*.o' \) -mtime -7 -exec rm {} \;
Equivalent command: find /system -type f \( -name "a.out" -o -name "*.o" \) -mtime -7 -delete