GNU Coreutils 9.12 speeds up cut and uniq and fixes a recursive traversal race

GNU Coreutils 9.12, released on September 14, 2026, delivers measurable wins — cut up to 4× faster, uniq up to 2.5× — and fixes a race that made -R commands fail against files deleted in parallel. A maintenance release that reminds us the GNU toolkit remains, against its Rust rewrite, the default foundation of every distribution.