In Linux, using the command tailf, how can I tail several log files that are inside a folder and in the subfolders?
tailf
This will recursively find all *.log files in current directory and its subfolders and tail them.
find . -type f \( -name "*.log" \) -exec tail -f "$file" {} +
Or shortly with xargs:
find . -name "*.log" | xargs tail -f