Find files or directories under a directory tree, recursively. More information: https://manned.org/find.
find root_path -name '*.ext'
find root_path -path '**/path/**/*.ext' -or -name '*pattern*'
find root_path -type d -iname '*lib*'
find root_path -name '*.py' -not -path '*/site-packages/*'
find root_path -maxdepth 1 -size +500k -size -10M
{}
within the command to access the filename):find root_path -name '*.ext' -exec wc -l {} \;
find root_path -daystart -mtime -1 -exec tar -cvf archive.tar {} \+
find root_path -type f -empty -delete