古いfind(1)と新しいfind(1)
ソース読むときのためのメモ。 https://www.gnu.org/software/findutils/manual/html_mono/find.html#fts The findutils source distribution contains two different implementations of find. The older implementation descends the file system recursively, while the newer one uses fts. Both are normally installed. If the option –without-fts was passed to configure, the recursive implementation is installed as find and the fts-based implementation is installed as ftsfind. Otherwise, the fts-based implementation