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NEWS
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GNU coreutils NEWS -*- outline -*-
* Noteworthy changes in release ?.? (????-??-??) [?]
** Bug fixes
'cp --symlink SRC DST' will again correctly validate DST.
If DST is a regular file and SRC is a symlink to DST,
then cp will no longer allow that operation to clobber DST.
Also with -d, if DST is a symlink, then it can always be replaced,
even if it points to SRC on a separate device.
[bugs introduced with coreutils-8.27]
'cp -n -u' and 'mv -n -u' now consistently ignore the -u option.
Previously, this option combination suffered from race conditions
that caused -u to sometimes override -n.
[bug introduced with coreutils-7.1]
'cp -a --no-preserve=mode' now sets appropriate default permissions
for non regular files like fifos and character device nodes etc.,
and leaves mode bits of existing files unchanged.
Previously it would have set executable bits on created special files,
and set mode bits for existing files as if they had been created.
[bug introduced with coreutils-8.20]
'cp --remove-destination file symlink' now removes the symlink
even if it can't be traversed.
[bug introduced with --remove-destination in fileutils-4.1.1]
ls no longer truncates the abbreviated month names that have a
display width between 6 and 12 inclusive. Previously this would have
output ambiguous months for Arabic or Catalan locales.
'ls -aA' is now equivalent to 'ls -A', since -A now overrides -a.
[bug introduced in coreutils-5.3.0]
'mv -n A B' no longer suffers from a race condition that can
overwrite a simultaneously-created B. This bug fix requires
platform support for the renameat2 or renameatx_np syscalls, found
in recent Linux and macOS kernels. As a side effect, ‘mv -n A A’
now silently does nothing if A exists.
[bug introduced with coreutils-7.1]
** Changes in behavior
'cp --force file symlink' now removes the symlink even if
it is self referential.
** Improvements
cut supports line lengths up to the max file size on 32 bit systems.
Previously only offsets up to SIZE_MAX-1 were supported.
stat and tail now know about the "exfs" file system, which is a
version of XFS. stat -f --format=%T now reports the file system type,
and tail -f uses inotify.
* Noteworthy changes in release 8.29 (2017-12-27) [stable]
** Bug fixes
b2sum no longer crashes when processing certain truncated check files.
[bug introduced with b2sum coreutils-8.26]
dd now ensures the correct cache ranges are specified for the "nocache"
and "direct" flags. Previously some pages in the page cache were not
invalidated. [bug introduced for "direct" in coreutils-7.5,
and with the "nocache" implementation in coreutils-8.11]
df no longer hangs when given a fifo argument.
[bug introduced in coreutils-7.3]
ptx -S no longer infloops for a pattern which returns zero-length matches.
[the bug dates back to the initial implementation]
shred --remove will again repeatedly rename files with shortening names
to attempt to hide the original length of the file name.
[bug introduced in coreutils-8.28]
stty no longer crashes when processing settings with -F also specified.
[bug introduced in fileutils-4.0]
tail --bytes again supports non seekable inputs on all systems.
On systems like android it always tried to process as seekable inputs.
[bug introduced in coreutils-8.24]
timeout will again notice its managed command exiting, even when
invoked with blocked CHLD signal, or in a narrow window where
this CHLD signal from the exiting child was missed. In each case
timeout would have then waited for the time limit to expire.
[bug introduced in coreutils-8.27]
** New features
timeout now supports the --verbose option to diagnose forced termination.
** Improvements
dd now supports iflag=direct with arbitrary sized files on all file systems.
tail --bytes=NUM will efficiently seek to the end of block devices,
rather than reading from the start.
Utilities which do not support long options (other than the default --help
and --version), e.g. cksum and sleep, now use more consistent error diagnostic
for unknown long options.
** Build-related
Default man pages are now distributed which are used if perl is
not available on the build system, or when cross compiling.
* Noteworthy changes in release 8.28 (2017-09-01) [stable]
** Bug fixes
cp and mv now merely warn about any failure to preserve symlink ownership.
Before, cp (without -p) would exit with a failure status, and a cross-device
mv would leave such symlinks behind in the source file system.
[the bug dates back to the initial implementation]
When creating numbered backups, cp, install, ln, and mv now avoid
races that could lose backup data in unlikely circumstances. Since
the fix relies on the renameat2 system call of Linux kernel 3.15 and
later, the races are still present on other platforms.
[the bug dates back to the initial implementation]
cp, install, ln, and mv no longer lose data when asked to copy a
backup file to its original via a differently-spelled file name.
E.g., 'rm -f a a~; : > a; echo data > a~; cp --backup=simple a~ ./a'
now fails instead of losing the data.
[the bug dates back to the initial implementation]
cp, install, ln, and mv now ignore nonsensical backup suffixes.
For example, --suffix='/' and --suffix='' are now no-ops.
[the bug dates back to the initial implementation]
date and touch no longer overwrite the heap with large
user specified TZ values (CVE-2017-7476).
[bug introduced in coreutils-8.27]
dd status=progress now just counts seconds; e.g., it outputs "6 s"
consistently rather than sometimes outputting "6.00001 s".
[bug introduced in coreutils-8.24]
df no longer interacts with excluded file system types, so for example
specifying -x nfs no longer hangs with problematic nfs mounts.
[bug introduced in coreutils-8.21]
df no longer interacts with dummy file system types, so for example
no longer hangs with problematic nfs mounted via system.automount(5).
[bug introduced in coreutils-8.21]
`groups inva:lid root` no longer exits immediately upon failure.
Now, it prints a diagnostic or a line to stdout for each argument.
[bug introduced in the bourne-shell-to-C rewrite for coreutils-6.11]
kill now converts from number to signal name correctly on AIX.
Previously it would have always returned the 'EXIT' name.
[bug introduced in fileutils-4.1.9]
ls now quotes symlink targets consistently. Previously it may not
have quoted the target name if the link name itself didn't need quoting.
[bug introduced in coreutils-8.26]
split no longer exits when invocations of a --filter return EPIPE.
[bug introduced in coreutils-8.26]
md5sum --check no longer incorrectly enables BSD reversed format mode when
ignoring some non checksum lines. This also affects sha*sum and b2sum.
[bug introduced in coreutils-8.14]
tail -F 'dir/file' is now monitored even when 'dir' is replaced.
[bug introduced with inotify support added in coreutils-7.5]
tail -f with --pid=PID now processes all inotify events.
Previously events may have been ignored completely upon PID death,
or ignored until future events on the monitored files.
[bug introduced with inotify support added in coreutils-7.5]
tail -f /dev/tty is now supported by not using inotify when any
non regular files are specified, as inotify is ineffective with these.
[bug introduced with inotify support added in coreutils-7.5]
uptime no longer outputs the AM/PM component of the current time,
as that's inconsistent with the 24 hour time format used.
[bug introduced in coreutils-7.0]
expr now returns number of characters matched (instead of incorrect
number of bytes matched) with 'match'/':' operators on multibyte strings.
** New features
expand and unexpand now support specifying an offset for tab stops
by prefixing the last specified number like --tabs=1,+8 which is
useful for visualizing diff output for example.
ls supports a new --hyperlink[=when] option to output file://
format links to files, supported by some terminals.
split supports a new --hex-suffixes[=from] option to create files with
lower case hexadecimal suffixes, similar to the --numeric-suffixes option.
env now has a --chdir (-C) option to change the working directory before
executing the subsidiary program.
expr supports multibyte strings for all string operations.
** Changes in behavior
tail -f now exits immediately if the output is piped and the reader of
the pipe terminates. That allows `tail -f file | grep -q foo` to return
responsively, but does make `tail -f file | :` exit immediately without
waiting for data. Instead one should now `tail -f file | grep -q .`
** Improvements
mv --verbose now distinguishes rename and copy operations.
stat -f -c %l, used to output the max file name length on a file system,
is now supported on FreeBSD and OpenBSD.
tail -f no longer erroneously warns about being ineffective
when following a single tty, as the simple blocking loop used
is effective in this case.
* Noteworthy changes in release 8.27 (2017-03-08) [stable]
** Bug fixes
cp --parents will now set an SELinux context for created directories,
as appropriate for the -a, --preseve=context, or -Z options.
[bug present since SELinux support added in coreutils-6.10]
date again converts from a specified time zone. Previously output was
not converted to the local time zone, and remained in the specified one.
[bug introduced in coreutils-8.26]
Commands like 'cp --no-dereference -l A B' are no longer quiet no-ops
when A is a regular file and B is a symbolic link that points to A.
[bug introduced in fileutils-4.0]
factor no longer goes into an infinite loop for certain numbers like
158909489063877810457 and 222087527029934481871.
[bug introduced in coreutils-8.20]
tail no longer prints redundant file headers with interleaved inotify events,
which could be triggered especially when tail was suspended and resumed.
[bug introduced with inotify support added in coreutils-7.5]
timeout no longer has a race that may terminate the wrong process.
The race is unlikely, as timeout(1) needs to receive a signal right
after the command being monitored finishes. Also the system needs
to have reallocated that command's pid in that short time window.
[bug introduced when timeout was added in coreutils-7.0]
wc --bytes --files0-from now correctly reports byte counts.
Previously it may have returned values that were too large,
depending on the size of the first file processed.
[bug introduced in coreutils-8.24]
** Improvements
The new 'date' option --rfc-email is now the long form for -R.
The new option spelling is intended to avoid the need to track the
Internet RFC number for email dates (currently RFC 5322). The old
option spellings --rfc-2822 and --rfc-822 still work.
date now outputs "-00" for a numeric time zone if the time is UTC
and the time zone abbreviation begins with "-", indicating that the
time zone is indeterminate.
nproc now honors the OMP_THREAD_LIMIT environment variable to
set the maximum returned value. OMP_NUM_THREADS continues to
set the minimum returned value, but is updated to support the
nested level syntax allowed in this variable.
stat and tail now know about the "rdt" file system, which is an interface
to Resource Director Technology. stat -f --format=%T now reports the
file system type, and tail -f uses inotify.
stty now validates arguments before interacting with the device,
ensuring there are no side effects to specifying an invalid option.
If the file B already exists, commands like 'ln -f A B' and
'cp -fl A B' no longer remove B before creating the new link.
That is, there is no longer a brief moment when B does not exist.
** New features
expand and unexpand now support specifying a tab size to use
after explicitly specified tab stops, by prefixing the last
specified number like --tabs=2,4,/8.
* Noteworthy changes in release 8.26 (2016-11-30) [stable]
** Bug fixes
cp, mv, and install no longer run into undefined behavior when
handling ACLs on Cygwin and Solaris platforms. [bug introduced in
coreutils-8.24]
cp --parents --no-preserve=mode, no longer copies permissions from source
directories, instead using default permissions for created directories.
[bug introduced in coreutils-5.93]
chcon, chgrp, chmod, chown, du, and rm, or specifically utilities
using the FTS interface, now diagnose failures returned by readdir().
[this bug was inherent in the use of fts: thus, for rm the bug was
introduced in coreutils-8.0. du, chmod, chgrp and chown started using
fts in 6.0. chcon was added in coreutils-6.9.91 with fts support. ]
date, du, ls, and pr no longer mishandle time zone abbreviations on
System V style platforms where this information is available only
in the global variable 'tzname'. [bug introduced in coreutils-8.24]
factor again outputs immediately when numbers are input interactively.
[bug introduced in coreutils-8.24]
head no longer tries to process non-seekable input as seekable,
which resulted in failures on FreeBSD 11 at least.
[bug introduced in coreutils-8.24]
install -DZ and mkdir -pZ now set default SELinux context correctly even if
two or more directories nested in each other are created and each of them
defaults to a different SELinux context.
ls --time-style no longer mishandles '%%b' in formats.
[bug introduced in coreutils-7.2]
md5sum --check --ignore-missing no longer treats files with checksums
starting with "00" as missing. This also affects sha*sum.
[bug introduced with the --ignore-missing feature in coreutils-8.25]
nl now resets numbering for each page section rather than just for each page.
[This bug was present in "the beginning".]
pr now handles specified separator strings containing tabs correctly.
Previously it would have output random data from memory.
[This bug was detected with ASAN and present in "the beginning".]
sort -h -k now works even in locales that use blank as thousands separator.
stty --help no longer outputs extraneous gettext header lines
for translated languages. [bug introduced in coreutils-8.24]
stty "sane" again sets "susp" to ^z on Solaris, and leaves "swtch" undefined.
[This bug previously fixed only on some older Solaris systems]
seq now immediately exits upon write errors.
[This bug was present in "the beginning".]
tac no longer crashes when there are issues reading from non-seekable inputs.
[bug introduced in coreutils-8.15]
tail -F now continues to process initially untailable files that are replaced
by a tailable file. This was handled correctly when inotify was available,
and is now handled correctly in all cases.
[bug introduced in fileutils-4.0h]
tail -f - 'untailable file' will now terminate when there is no more data
to read from stdin. Previously it behaved as if --retry was specified.
[This bug was present in "the beginning".]
tail -f 'remote file' will now avoid outputting repeated data on network
file systems that misreport file sizes through stale metadata.
[This bug was present in "the beginning" but exacerbated in coreutils-8.24]
tail -f --retry 'missing file' will now process truncations of that file.
Previously truncation was ignored thus not outputting new data in the file.
[bug introduced in coreutils-5.3.0]
tail -f will no longer continually try to open inaccessible files,
only doing so if --retry is specified.
[This bug was present in "the beginning".]
yes now handles short writes, rather than assuming all writes complete.
[bug introduced in coreutils-8.24]
** Changes in behavior
rm no longer accepts shortened variants of the --no-preserve-root option.
seq no longer accepts 0 value as increment, and now also rejects NaN
values for any argument.
stat now outputs nanosecond information for timestamps even if
they are out of localtime range.
sort, tail, and uniq now support traditional usage like 'sort +2'
and 'tail +10' on systems conforming to POSIX 1003.1-2008 and later.
The 2008 edition of POSIX dropped the requirement that arguments
like '+2' must be treated as file names.
** Improvements
dd now warns about counts specified with a 0x "prefix", since dd will
interpret those as a zero multiplier rather than a hex constant.
The warning suggests to use 00x if a zero multiplier is really intended.
df now filters the system mount list more efficiently, with 20000
mount entries now being processed in about 1.1s compared to 1.7s.
du, shuf, sort, and uniq no longer fail to process a specified file
when their stdin is closed, which would have happened with glibc >= 2.14.
install -Z now also sets the default SELinux context for created directories.
ls is now fully responsive to signals until the first escape sequence is
written to a terminal.
ls now aligns quoted items with non quoted items, which is easier to read,
and also better indicates that the quote is not part of the actual name.
stat and tail now know about these file systems:
"balloon-kvm-fs" KVM dynamic RAM allocation support,
"cgroup2" Linux Control Groups V2 support,
"daxfs" Optical media file system,
"m1fs" A Plexistor file system,
"prl_fs" A parallels file system,
"smb2" Samba for SMB protocol V2,
"wslfs" Windows Subsystem for Linux,
"zsmalloc" Linux compressed swap support,
stat -f --format=%T now reports the file system type, and
tail -f uses polling for "prl_fs" and "smb2", and inotify for others.
stat --format=%N for quoting file names now honors the
same QUOTING_STYLE environment variable values as ls.
** New programs
b2sum is added to support the BLAKE2 digest algorithm with
a similar interface to the existing md5sum and sha1sum, etc. commands.
** New Features
comm now accepts the --total option to output a summary at the end.
date now accepts the --debug option, to annotate the parsed date string,
display timezone information, and warn about potential misuse.
date now accepts the %q format to output the quarter of the year.
* Noteworthy changes in release 8.25 (2016-01-20) [stable]
** Bug fixes
cp now correctly copies files with a hole at the end of the file,
and extents allocated beyond the apparent size of the file.
That combination resulted in the trailing hole not being reproduced.
[bug introduced in coreutils-8.10]
cut --fields no longer outputs extraneous characters on some uClibc configs.
[bug introduced in coreutils-6.11]
install -D again copies relative file names when absolute file names
are also specified along with an absolute destination directory name.
[bug introduced in coreutils-6.2]
ls no longer prematurely wraps lines when printing short file names.
[bug introduced in coreutils-5.1.0]
mv no longer causes data loss due to removing a source directory specified
multiple times, when that directory is also specified as the destination.
[bug introduced in coreutils-8.24]
shred again uses defined patterns for all iteration counts.
[bug introduced in coreutils-5.93]
sort --debug -b now correctly marks the matching extents for keys
that specify an offset for the first field.
[bug introduced with the --debug feature in coreutils-8.6]
tail -F now works with initially non existent files on a remote file system.
[bug introduced in coreutils-7.5]
** New commands
base32 is added to complement the existing base64 command,
and encodes and decodes printable text as per RFC 4648.
** New features
comm,cut,head,numfmt,paste,tail now have the -z,--zero-terminated option, and
tac --separator accepts an empty argument, to work with NUL delimited items.
dd now summarizes sizes in --human-readable format too, not just --si.
E.g., "3441325000 bytes (3.4 GB, 3.2 GiB) copied". It omits the summaries
if they would not provide useful information, e.g., "3 bytes copied".
Its status=progress output now uses the same format as ordinary status,
perhaps with trailing spaces to erase previous progress output.
md5sum now supports the --ignore-missing option to allow
verifying a subset of files given a larger list of checksums.
This also affects sha1sum, sha224sum, sha256sum, sha384sum and sha512sum.
printf now supports the '%q' format to print arguments in a form that
is reusable by most shells, with non-printable characters escaped
with the POSIX proposed $'...' syntax.
stty now supports the "[-]drain" setting to control whether to wait
for transmission of pending output before application of settings.
** Changes in behavior
base64 no longer supports hex or oct --wrap parameters,
thus better supporting decimals with leading zeros.
date --iso-8601 now uses +00:00 timezone format rather than +0000.
The standard states to use this "extended" format throughout a timestamp.
df now prefers sources towards the root of a device when
eliding duplicate bind mounted entries.
ls now quotes file names unambiguously and appropriate for use in a shell,
when outputting to a terminal.
join, sort, uniq with --zero-terminated, now treat '\n' as a field delimiter.
** Improvements
All utilities now quote user supplied arguments in error strings,
which avoids confusing error messages in the presence of '\r' chars etc.
Utilities that traverse directories, like chmod, cp, and rm etc., will operate
more efficiently on XFS through the use of "leaf optimization".
md5sum now ensures a single line per file for status on standard output,
by using a '\' at the start of the line, and replacing any newlines with '\n'.
This also affects sha1sum, sha224sum, sha256sum, sha384sum and sha512sum.
dircolors now supports globbing of TERM entries in its database.
For example "TERM *256color*" is now supported.
du no longer stats all mount points at startup, only doing so
upon detection of a directory cycle.
[issue introduced in coreutils-8.20]
ls -w0 is now interpreted as no limit on the length of the outputted line.
stat -f --format=%T now reports the file system type for new Linux
pseudo file systems "bpf_fs", "btrfs_test", "nsfs", "overlayfs"
and "tracefs", and remote file system "acfs".
wc now ensures a single line per file for counts on standard output,
by quoting names containing '\n' characters; appropriate for use in a shell.
* Noteworthy changes in release 8.24 (2015-07-03) [stable]
** Bug fixes
dd supports more robust SIGINFO/SIGUSR1 handling for outputting statistics.
Previously those signals may have inadvertently terminated the process.
df --local no longer hangs with inaccessible remote mounts.
[bug introduced in coreutils-8.21]
du now silently ignores all directory cycles due to bind mounts.
Previously it would issue a warning and exit with a failure status.
[bug introduced in coreutils-8.1 and partially fixed in coreutils-8.23]
chroot again calls chroot(DIR) and chdir("/"), even if DIR is "/".
This handles separate bind mounted "/" trees, and environments
depending on the implicit chdir("/").
[bugs introduced in coreutils-8.23]
cp no longer issues an incorrect warning about directory hardlinks when a
source directory is specified multiple times. Now, consistent with other
file types, a warning is issued for source directories with duplicate names,
or with -H the directory is copied again using the symlink name.
factor avoids writing partial lines, thus supporting parallel operation.
[the bug dates back to the initial implementation]
head, od, split, tac, tail, and wc no longer mishandle input from files in
/proc and /sys file systems that report somewhat-incorrect file sizes.
mkdir --parents -Z now correctly sets the context for the last component,
even if the parent directory exists and has a different default context.
[bug introduced with the -Z restorecon functionality in coreutils-8.22]
numfmt no longer outputs incorrect overflowed values seen with certain
large numbers, or with numbers with increased precision.
[bug introduced when numfmt was added in coreutils-8.21]
numfmt now handles leading zeros correctly, not counting them when
settings processing limits, and making them optional with floating point.
[bug introduced when numfmt was added in coreutils-8.21]
paste no longer truncates output for large input files. This would happen
for example with files larger than 4GiB on 32 bit systems with a '\n'
character at the 4GiB position.
[the bug dates back to the initial implementation]
rm indicates the correct number of arguments in its confirmation prompt,
on all platforms. [bug introduced in coreutils-8.22]
shuf -i with a single redundant operand, would crash instead of issuing
a diagnostic. [bug introduced in coreutils-8.22]
tail releases inotify resources when unused. Previously it could exhaust
resources with many files, or with -F if files were replaced many times.
[bug introduced in coreutils-7.5]
tail -f again follows changes to a file after it's renamed.
[bug introduced in coreutils-7.5]
tail --follow no longer misses changes to files if those files were
replaced before inotify watches were created.
[bug introduced in coreutils-7.5]
tail --follow consistently outputs all data for a truncated file.
[bug introduced in the beginning]
tail --follow=name correctly outputs headers for multiple files
when those files are being created or renamed.
[bug introduced in coreutils-7.5]
** New features
chroot accepts the new --skip-chdir option to not change the working directory
to "/" after changing into the chroot(2) jail, thus retaining the current wor-
king directory. The new option is only permitted if the new root directory is
the old "/", and therefore is useful with the --group and --userspec options.
dd accepts a new status=progress level to print data transfer statistics
on stderr approximately every second.
numfmt can now process multiple fields with field range specifications similar
to cut, and supports setting the output precision with the --format option.
split accepts a new --separator option to select a record separator character
other than the default newline character.
stty allows setting the "extproc" option where supported, which is
a useful setting with high latency links.
sync no longer ignores arguments, and syncs each specified file, or with the
--file-system option, the file systems associated with each specified file.
tee accepts a new --output-error option to control operation with pipes
and output errors in general.
** Changes in behavior
df no longer suppresses separate exports of the same remote device, as
these are generally explicitly mounted. The --total option does still
suppress duplicate remote file systems.
[suppression was introduced in coreutils-8.21]
mv no longer supports moving a file to a hardlink, instead issuing an error.
The implementation was susceptible to races in the presence of multiple mv
instances, which could result in both hardlinks being deleted. Also on case
insensitive file systems like HFS, mv would just remove a hardlinked 'file'
if called like `mv file File`. The feature was added in coreutils-5.0.1.
numfmt --from-unit and --to-unit options now interpret suffixes as SI units,
and IEC (power of 2) units are now specified by appending 'i'.
tee will exit early if there are no more writable outputs.
tee does not treat the file operand '-' as meaning standard output any longer,
for better conformance to POSIX. This feature was added in coreutils-5.3.0.
timeout --foreground no longer sends SIGCONT to the monitored process,
which was seen to cause intermittent issues with GDB for example.
** Improvements
cp,install,mv will convert smaller runs of NULs in the input to holes,
and cp --sparse=always avoids speculative preallocation on XFS for example.
cp will read sparse files more efficiently when the destination is a
non regular file. For example when copying a disk image to a device node.
mv will try a reflink before falling back to a standard copy, which is
more efficient when moving files across BTRFS subvolume boundaries.
stat and tail now know about IBRIX. stat -f --format=%T now reports the file
system type, and tail -f uses polling for files on IBRIX file systems.
wc -l processes short lines much more efficiently.
References from --help and the man pages of utilities have been corrected
in various cases, and more direct links to the corresponding online
documentation are provided.
* Noteworthy changes in release 8.23 (2014-07-18) [stable]
** Bug fixes
chmod -Rc no longer issues erroneous warnings for files with special bits set.
[bug introduced in coreutils-6.0]
cp -a, mv, and install --preserve-context, once again set the correct SELinux
context for existing directories in the destination. Previously they set
the context of an existing directory to that of its last copied descendant.
[bug introduced in coreutils-8.22]
cp -a, mv, and install --preserve-context, no longer seg fault when running
with SELinux enabled, when copying from file systems that return an error
when reading the SELinux context for a file.
[bug introduced in coreutils-8.22]
cp -a and mv now preserve xattrs of symlinks copied across file systems.
[bug introduced with extended attribute preservation feature in coreutils-7.1]
date could crash or go into an infinite loop when parsing a malformed TZ="".
[bug introduced with the --date='TZ="" ..' parsing feature in coreutils-5.3.0]
dd's ASCII and EBCDIC conversions were incompatible with common practice and
with POSIX, and have been corrected as follows. First, conv=ascii now
implies conv=unblock, and conv=ebcdic and conv=ibm now imply conv=block.
Second, the translation tables for dd conv=ascii and conv=ebcdic have been
corrected as shown in the following table, where A is the ASCII value, W is
the old, wrong EBCDIC value, and E is the new, corrected EBCDIC value; all
values are in octal.
A W E
041 117 132
133 112 255
135 132 275
136 137 232
174 152 117
176 241 137
313 232 152
325 255 112
345 275 241
[These dd bugs were present in "the beginning".]
df has more fixes related to the newer dynamic representation of file systems:
Duplicates are elided for virtual file systems like tmpfs.
Details for the correct device are output for points mounted multiple times.
Placeholder values are output for inaccessible file systems, rather than
than error messages or values for the wrong file system.
[These bugs were present in "the beginning".]
df now outputs all appropriate entries in the presence of bind mounts.
On some systems, entries would have been incorrectly elided due to
them being considered "dummy" mounts.
[bug introduced in coreutils-8.22]
du now silently ignores directory cycles introduced with bind mounts.
Previously it would issue a warning and exit with a failure status.
[bug introduced in coreutils-8.1]
head --bytes=-N and --lines=-N now handles devices more
consistently, not ignoring data from virtual devices like /dev/zero,
or on BSD systems data from tty devices.
[bug introduced in coreutils-5.0.1]
head --bytes=-N - no longer fails with a bogus diagnostic when stdin's
seek pointer is not at the beginning.
[bug introduced with the --bytes=-N feature in coreutils-5.0.1]
head --lines=-0, when the input does not contain a trailing '\n',
now copies all input to stdout. Previously nothing was output in this case.
[bug introduced with the --lines=-N feature in coreutils-5.0.1]
id, when invoked with no user name argument, now prints the correct group ID.
Previously, in the default output format, it would print the default group ID
in the password database, which may be neither real nor effective. For e.g.,
when run set-GID, or when the database changes outside the current session.
[bug introduced in coreutils-8.1]
ln -sf now replaces symbolic links whose targets can't exist. Previously
it would display an error, requiring --no-dereference to avoid the issue.
[bug introduced in coreutils-5.3.0]
ln -sr '' F no longer segfaults. Now works as expected.
[bug introduced with the --relative feature in coreutils-8.16]
numfmt now handles blanks correctly in all unibyte locales. Previously
in locales where character 0xA0 is a blank, numfmt would mishandle it.
[bug introduced when numfmt was added in coreutils-8.21]
ptx --format long option parsing no longer falls through into the --help case.
[bug introduced in TEXTUTILS-1_22i]
ptx now consistently trims whitespace when processing multiple files.
[This bug was present in "the beginning".]
seq again generates correct output with start or end values = -0.
[bug introduced in coreutils-8.20.]
shuf --repeat no longer dumps core if the input is empty.
[bug introduced with the --repeat feature in coreutils-8.22]
sort when using multiple threads now avoids undefined behavior with mutex
destruction, which could cause deadlocks on some implementations.
[bug introduced in coreutils-8.6]
tail -f now uses polling mode for VXFS to cater for its clustered mode.
[bug introduced with inotify support added in coreutils-7.5]
** New features
od accepts a new option: --endian=TYPE to handle inputs with different byte
orders, or to provide consistent output on systems with disparate endianness.
configure accepts the new option --enable-single-binary to build all the
selected programs in a single binary called "coreutils". The selected
programs can still be called directly using symlinks to "coreutils" or
shebangs with the option --coreutils-prog= passed to this program. The
install behavior is determined by the option --enable-single-binary=symlinks
or --enable-single-binary=shebangs (the default). With the symlinks option,
you can't make a second symlink to any program because that will change the
name of the called program, which is used by coreutils to determine the
desired program. The shebangs option doesn't suffer from this problem, but
the /proc/$pid/cmdline file might not be updated on all the platforms. The
functionality of each program is not affected but this single binary will
depend on all the required dynamic libraries even to run simple programs.
If you desire to build some tools outside the single binary file, you can
pass the option --enable-single-binary-exceptions=PROG_LIST with the comma
separated list of programs you want to build separately. This flag
considerably reduces the overall size of the installed binaries which makes
it suitable for embedded system.
** Changes in behavior
chroot with an argument of "/" no longer implicitly changes the current
directory to "/", allowing changing only user credentials for a command.
chroot --userspec will now unset supplemental groups associated with root,
and instead use the supplemental groups of the specified user.
cut -d$'\n' again outputs lines identified in the --fields list, having
not done so in v8.21 and v8.22. Note using this non portable functionality
will result in the delayed output of lines.
ls with none of LS_COLORS or COLORTERM environment variables set,
will now honor an empty or unknown TERM environment variable,
and not output colors even with --colors=always.
** Improvements
chroot has better --userspec and --group look-ups, with numeric IDs never
causing name look-up errors. Also look-ups are first done outside the chroot,
in case the look-up within the chroot fails due to library conflicts etc.
install now allows the combination of the -D and -t options.
numfmt supports zero padding of numbers using the standard printf
syntax of a leading zero, for example --format="%010f".
Also throughput was improved by up to 800% by avoiding redundant processing.
shred now supports multiple passes on GNU/Linux tape devices by rewinding
the tape before each pass, avoids redundant writes to empty files,
uses direct I/O for all passes where possible, and attempts to clear
inode storage used for small files on some file systems.
split avoids unnecessary input buffering, immediately writing input to output
which is significant with --filter or when writing to fifos or stdout etc.
stat and tail work better with HFS+, HFSX, LogFS and ConfigFS. stat -f
--format=%T now reports the file system type, and tail -f now uses inotify,
rather than the default of issuing a warning and reverting to polling.
* Noteworthy changes in release 8.22 (2013-12-13) [stable]
** Bug fixes
df now processes the mount list correctly in the presence of unstatable
mount points. Previously it may have failed to output some mount points.
[bug introduced in coreutils-8.21]
df now processes symbolic links and relative paths to special files containing
a mounted file system correctly. Previously df displayed the statistics about
the file system the file is stored on rather than the one inside.
[This bug was present in "the beginning".]
df now processes disk device nodes correctly in the presence of bind mounts.
Now df shows the base mounted file system rather than the last one mounted.
[This bug was present in "the beginning".]
install now removes the target file if the strip program failed for any
reason. Before, that file was left behind, sometimes even with wrong
permissions.
[This bug was present in "the beginning".]
ln --relative now updates existing symlinks correctly. Previously it based
the relative link on the dereferenced path of an existing link.
[This bug was introduced when --relative was added in coreutils-8.16.]
ls --recursive will no longer exit with "serious" exit code (2), if there
is an error reading a directory not specified on the command line.
[Bug introduced in coreutils-5.3.0]
mkdir, mkfifo, and mknod now work better when creating a file in a directory
with a default ACL whose umask disagrees with the process's umask, on a
system such as GNU/Linux where directory ACL umasks override process umasks.
[bug introduced in coreutils-6.0]
mv will now replace empty directories in the destination with directories
from the source, when copying across file systems.
[This bug was present in "the beginning".]
od -wN with N larger than 64K on a system with 32-bit size_t would
print approximately 2*N bytes of extraneous padding.
[Bug introduced in coreutils-7.0]
rm -I now prompts for confirmation before removing a write protected file.
[Bug introduced in coreutils-6.8]
shred once again uses direct I/O on systems requiring aligned buffers.
Also direct I/O failures for odd sized writes at end of file are now handled.
[The "last write" bug was introduced in coreutils-5.3.0 but masked
by the alignment bug introduced in coreutils-6.0]
tail --retry -f now waits for the files specified to appear. Before, tail
would immediately exit when such a file is initially inaccessible.
[This bug was introduced when inotify support was added in coreutils-7.5]
tail -F has improved handling of symlinks. Previously tail didn't respond
to the symlink target (re)appearing after being (re)created.
[This bug was introduced when inotify support was added in coreutils-7.5]
** New features
cp, install, mkdir, mknod, mkfifo and mv now support "restorecon"
functionality through the -Z option, to set the SELinux context
appropriate for the new item location in the file system.
csplit accepts a new option: --suppressed-matched, to elide the lines
used to identify the split points.
df --output now accepts a 'file' field, to propagate a specified
command line argument through to the output.
du accepts a new option: --inodes to show the number of inodes instead
of the blocks used.
id accepts a new option: --zero (-z) to delimit the output entries by
a NUL instead of a white space character.
id and ls with -Z report the SMACK security context where available.
mkdir, mkfifo and mknod with --context set the SMACK context where available.
id can now lookup by user ID, in addition to the existing name lookup.
join accepts a new option: --zero-terminated (-z). As with the sort,uniq
option of the same name, this makes join consume and produce NUL-terminated
lines rather than newline-terminated lines.
uniq accepts a new option: --group to print all items, while separating
unique groups with empty lines.
shred accepts new parameters to the --remove option to give greater
control over that operation, which can greatly reduce sync overhead.
shuf accepts a new option: --repeat (-r), which can repeat items in
the output.
** Changes in behavior
cp --link now dereferences a symbolic link as source before creating the
hard link in the destination unless the -P,--no-deref option is specified.
Previously, it would create a hard link of the symbolic link, even when
the dereferencing options -L or -H were specified.
cp, install, mkdir, mknod and mkfifo no longer accept an argument to the
short -Z option. The --context equivalent still takes an optional argument.
dd status=none now suppresses all non fatal diagnostic messages,
not just the transfer counts.
df no longer accepts the long-obsolescent --megabytes option.
stdbuf now requires at least one buffering mode option to be specified,
as per the documented interface.
** Improvements
base64 encoding throughput for bulk data is increased by about 60%.
md5sum can use libcrypto hash routines where allowed to potentially
get better performance through using more system specific logic.
sha1sum for example has improved throughput by 40% on an i3-2310M.
This also affects sha1sum, sha224sum, sha256sum, sha384sum and sha512sum.
stat and tail work better with EFIVARFS, EXOFS, F2FS, HOSTFS, SMACKFS, SNFS
and UBIFS. stat -f --format=%T now reports the file system type, and tail -f
now uses inotify for files on all those except SNFS, rather than the default
(for unknown file system types) of issuing a warning and reverting to polling.
shuf outputs subsets of large inputs much more efficiently.
Reservoir sampling is used to limit memory usage based on the number of
outputs, rather than the number of inputs.
shred increases the default write block size from 12KiB to 64KiB
to align with other utilities and reduce the system call overhead.