The find Command
ls only shows you what is in one directory at a time. The find command searches recursively through directories for files matching criteria you specify.
Basic Syntax
find /path -name "filename" find / -name ".txt" find / -name "flag"
Useful Options
-name — search by filename -type f — only files -type d — only directories -size +1M — files larger than 1MB
Your Mission
A flag file has been hidden somewhere on the server. It is named flag.txt but you do not know where it is.
Use find to locate it, then cat its contents.
Example
find / -name "flag.txt" 2>/dev/null
The 2>/dev/null part hides permission errors so the output is clean.