Task: search for all .txt files in the /testbed directory, prints their paths, and then search within each file for the word "another"
Command: find /testbed -name "*.txt" \( -exec echo {} \; -o -exec true \; \) -exec grep another {} \;
Equivalent command: find /testbed -type f -name "*.txt" -print -exec grep -H "another" {} \;