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Rust Coreutils 0.12.0 Release:

We are happy to announce the release of Rust Coreutils 0.12.0 - a release focused on compatibility fixes for our Ubuntu friends. Ubuntu ships uutils coreutils as its default coreutils implementation, and this cycle was driven by what their users and maintainers reported: the bugs they asked us to prioritize are all fixed here, along with a long tail of smaller divergences from GNU. Few of these are glamorous, but they are exactly what breaks a script that has worked for twenty years.

Alongside that, we removed the last C dependency of expr (onig is replaced by the pure-Rust fancy-regex), continued the Windows port (nice, nohup and hostid now build there, and uucore's filesystem layer was rewritten with safe Win32 wrappers) and landed another round of security hardening on ls, sort and install. Also, some contributions had carried comments and code over from GNU coreutils, against our own rule that uutils is an original implementation. We reviewed the tree and rewrote what we found, in comments and in the few functions that followed the C too closely; no behaviour change. The GNU coreutils maintainers have been notified.

GNU coreutils 9.12 was released during our cycle (kudos to the team!), and some of the work went that way too. Chasing compatibility tends to turn up things worth fixing or improving on both sides.

We also made it official: a utility being significantly slower than GNU is now treated as a bug, not a wishlist item. If you hit one, please report it as a bug.

We are now at 653 passing, 21 failing, 0 errors on the GNU test suite.

GNU Test Suite Compatibility:

Result 0.11.0 0.12.0 Change 0.11.0 to 0.12.0 % Total 0.11.0 % Total 0.12.0 % Change 0.11.0 to 0.12.0
Pass 653 653 0 95.33% 94.36% -0.97%
Skip 10 18 +8 1.46% 2.60% +1.14%
Fail 22 21 -1 3.21% 3.03% -0.18%
Error 0 0 0 0% 0% 0%
Total 685 692 +7 (new tests)

Note: the suite grew by 7 tests (backport of GNU tests) and 8 more tests are skipped on our reference runner, so the raw pass count is flat while the failures went down again. Counting only the tests that actually run, we are at 653/674 (96.9%), our best ratio so far, and the second release in a row with no erroring test. We are comparing against Coreutils 9.11.

GNU testsuite evolution

Highlights:

  • Ubuntu Compatibility
  • The issues Ubuntu asked us to fix first are all fixed: data loss in a parallel install -D (#12355), du on 32-bit architectures (#11848), ls ACL dereferencing (#13234), cp -R name collisions (LP#2167118) and chmod -R through symlinks (LP#2167122)
  • A whole family of options now accept a hyphen-leading value, like GNU does: csplit --suffix-format, paste -d, join -t, stat --format/--printf/-c and all of numfmt's options. A - in a delimiter or a format string is data, not a flag
  • rm no longer segfaults on very deeply nested directories
  • sort -n applies to the key instead of the whole line, echoes a disorder line verbatim instead of reformatting it as a number, and no longer keeps every input file open while sorting
  • basename trailing-separator handling for dot components, realpath exit status in quiet mode, ln keeping the destination when a forced link fails, csplit always creating the final split even when empty, fmt -x/-X, printf treating a -- past the format as an argument, test rejecting an -a/-o that ends the expression, echo -e no longer expanding \u, \U and \"
  • ls: dired fixes, a tie in the time sort broken by the name, name sort for -u/-c in long format, capability markers that respect the dereference config; dir and vdir match the GNU default quoting
  • cp: --no-preserve is retained over a later --preserve, and --attributes-only gives the destination the source's type
  • Error messages and exit codes aligned with GNU in uniq, chgrp, factor, date, expr, od, tty, tsort and pathchk

  • truncate finally implements --io-blocks, and date accepts multiple --reference

  • Security Hardening

  • ls: report stat() failures on directory entries instead of silently showing wrong metadata
  • sort: temporary files are created with mode 0600 instead of the umask, the -o output copy is kept private too, and a failure to truncate the output file is now reported
  • install: the fd-based destination is created exclusively and at 0600
  • rm, chmod, chown, chgrp: --preserve-root compares (st_dev, st_ino) rather than the path
  • chcon walks directories with DirFd instead of fts

  • SECURITY.md now requires a boundary crossing, not just a GNU divergence, for a report to be treated as a vulnerability

  • Robustness

  • Panics and overflows fixed in stat (out-of-range octal escape), ls (a color style with no attributes), split (a huge -n l/K/N chunk count), truncate (a size above i64::MAX no longer creates the file), cksum (an over-length BLAKE2b digest in a check file) and uucore (invalid input lines)

  • tsort handles invalid UTF-8 input and flushes stdout properly; date reports invalid UTF-8 lines in -f input; truncate supports non-UTF-8 paths for --reference

  • Dependency Diet

  • expr replaces onig with fancy-regex, removing a C dependency and the CI hacks that came with it. As a side effect, expr switched to leftmost-longest regex matching, matching GNU
  • mv replaces fs_extra with std directory sizing; fts-sys is gone; cksum uses aws-lc instead of vendored OpenSSL on MSVC, so a Perl install is no longer needed to build on Windows

  • bstr default features disabled, uucore's hand-rolled process functions dropped in favor of rustix

  • Cross-platform Reach

  • Windows: nice (with a Priority Class mapping), nohup and hostid now build, dirname handles backslashes, user locale detection landed, checksum paths use forward slashes, and mv, sync, hostname, touch and rm moved to safe std APIs
  • uucore on Windows: fsext rewritten with safe Win32 wrappers, real free space and mount paths; df resolves paths by mount prefix
  • New and improved targets: aarch64-unknown-linux-ohos, AIX (fsext), Haiku (fs), Hurd (signals), NetBSD (safe-traversal), plus wider process, utmpx and entries support
  • WASI: cp attribute preservation and reflink handling, mktemp temporary directories, tail integration coverage

  • macOS: tail stdin-redirect, pid and follow-name tests re-enabled

  • Performance

  • sort gained benchmarks for spilling, checking and shared prefixes; du benchmarks now warm the OS page cache before timing
  • cp avoids resolving the cwd for absolute recursive copies; tsort gives the OS a sequential access hint

  • A significant performance gap with GNU is now stated in the README as a bug, and we handle it as one

  • Contributions: This release landed 191 pull requests from 16 new contributors

Call to Action:

Try it in your browser - Online Playground powered by WebAssembly Help us translate - Contribute to Rust Coreutils on Weblate Sponsor us on GitHub to accelerate development: github.com/sponsors/uutils

What's Changed

basename

chcon

chgrp

chmod

chown

cksum

cp

csplit

date

dd

dir

dirname

du

echo

env

expr

factor

fmt

head

hostid

hostname

install

join

link

ln

logname

ls

mknod

mktemp

mv

nice

nohup

numfmt

od

paste

pathchk

pinky

pr

printf

ptx

realpath

rm

sort

split

stat

stty

sync

tail

test

touch

truncate

tsort

tty

uniq

uptime

vdir

who

uucore

Testing

Code Quality & Cleanup

CI & Build

Documentation

Platform Support

Dependency Updates

Version Management

New Contributors

Full Changelog: https://github.com/uutils/coreutils/compare/0.11.0...0.12.0

Source: README.md, updated 2026-09-16