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2016-01-06stty: support "flusho" local settingPádraig Brady
This is used to discard terminal output on FreeBSD based systems. * src/stty.c (mode_info): Add FLUSHO where supported. (usage): Document for "local" and "combination" settings. * doc/coreutils.texi (local stty settings): Document, mentioning that this option is supported but ignored on GNU/Linux.
2016-01-06stty: support [-]drain setting to control waiting for pending TxPádraig Brady
Instead of commit v8.24-132-g5171bef which only provides control to disable this behavior (with -I), provide the symmetrical "[-]drain" special setting. * src/stty.c (main): Parse the [-]drain setting instead of -I, and treat like a global option. (usage): Adjust accordingly. * tests/misc/stty.sh: Test "drain" with and without options. * NEWS: Mention the new feature.
2016-01-04stty: support -I, --immediate to not wait for pending transmissionPádraig Brady
In some cases an initial drain may block indefinitely as discussed at: http://lists.gnu.org/archive/html/coreutils/2016-01/msg00007.html * src/stty.c (main): Use TCSANOW rather than TCSADRAIN if -I specified. (usage): Document the new option. * doc/coreutils.texi (stty invocation): Likewise. * tests/misc/stty.sh: Ensure -I is supported. * NEWS: Mention the new feature.
2016-01-03doc: avoid unwanted display of the 'coreutils' command infoPádraig Brady
* doc/coreutils.texi (coreutils): Remove this direntry so that `info coreutils` will display the table of contents, rather than the unlikely intended coreutils Multi-call invocation. This also supports lookups like `info coreutils readlink`, but note that only works with the standard info viewer, and not with pinfo for example.
2016-01-03doc: mention in more places that -D will create --target-directoryPádraig Brady
* src/install.c (usage): Mention this commonly required functionality in the -D option description. * doc/coreutils.texi (install invocation): Likewise for the --target-directory description.
2016-01-01maint: update all copyright year number rangesPádraig Brady
Run "make update-copyright" and then... * gnulib: Update to latest with copyright year adjusted. * tests/init.sh: Sync with gnulib to pick up copyright year. * bootstrap: Likewise. * tests/sample-test: Adjust to use the single most recent year.
2015-12-31dd: summarize in --human-readable format tooPaul Eggert
Problem reported by Linda Walsh in: http://bugs.gnu.org/17505 * NEWS: Document this. * doc/coreutils.texi (dd invocation): Use a simpler script. Adjust output example to match new behavior. * src/dd.c (human_size): Remove. All uses changed to use human_readable and ... (human_opts): ... this new constant. (abbreviation_lacks_prefix): New function. (print_xfer_stats): Use it. Output both --si and --human-readable summaries, but only if they have prefixes. * tests/dd/reblock.sh, tests/dd/stats.sh: Test new behavior.
2015-12-22doc: describe test operator precedence and associativityPádraig Brady
* doc/coreutils.texi (Connectives for test): Add notes on precedence and associativity. Also mention the portability caveats with these operators. * cfg.mk: Avoid sc_prohibit_test_minus_ao for coreutils.texi. Fixes http://bugs.gnu.org/22216
2015-12-14maint: fix incorrect spellings etcPádraig Brady
* NEWS: Use a standard version specification. * doc/coreutils.texi: Fix incorrect grammar. * src/df.c: Update a stale comment. * src/copy.c: Fix incorrect spellings. * src/factor.c: Likewise. * src/ls.c: Likewise. * src/pr.c: Likewise. * src/relpath.c: Likewise. * src/shred.c: Likewise. * src/sort.c: Likewise. * src/split.c: Likewise. * src/stdbuf.c: Likewise. * tests/misc/seq-precision.sh: Likewise.
2015-12-07doc: promote 'sort --debug'Paul Eggert
* README, doc/coreutils.texi (Introduction, sort invocation): Suggest 'sort --debug' more prominently.
2015-12-01doc: clarify behaviour of mv for existing target directoriesBernhard Voelker
* doc/coreutils.texi (mv invocation): Add a sentence to clarify that mv(1) will only replace empty directories in the target, and fail with a diagnostic otherwise. Discussed at: http://lists.gnu.org/archive/html/coreutils/2015-12/msg00000.html
2015-11-30doc: avoid confusing K argument in the man pages of head and tailBernhard Voelker
The character 'K' representing numeric user input can be confusing, especially in the context where it can be suffixed by the multipliers K, M, G, etc. Use NUM instead. * doc/coreutils.texi (head invocation): Replace @var{k} by @var{num}. Also change @var{count} in the paragraph about the obsolete option syntax. (tail invocation): Likewise. Furthermore, adjust the option order to alphabetical sorting. * src/head.c (usage): s/K/NUM/ in as placeholder in the -c and -n options. Furthermore, print the actual DEFAULT_NUMBER instead of the hard-coded 10. * src/tail.c (usage): s/K/NUM/ in as placeholder in the -c and -n options. Add "[+]" to clarify that NUM may optionally be preceded by this sign. Remove the redundant explanation of the optional '+' prefix for NUM, as that is now clear from the option description above. Suggested by Dan Jacobson in http://bugs.gnu.org/22042
2015-11-25build: avoid makeinfo unless requiredPádraig Brady
* doc/local.mk (constants.texi): Avoid calling makeinfo unless the constants derived from tail and shred have changed. This avoids a dependence on makeinfo from patched sources, and avoids an expensive makeinfo call for developers.
2015-11-25doc: clarify descriptions for tr --squeeze-repeatsPádraig Brady
* doc/coreutils.texi (uniq invocation): Fix the description of problematic input to say "blank lines" rather than "two or more blank lines". (tr invocation): Clarify that -s only works with SET1 when not translating (when SET2 not specified). Also explicitly state in examples where blank lines are deleted. Also add "deleting" to the menu item. * src/tr.c (usage): Improve the -s summary to say it always operates on the last specified SET.
2015-11-25doc: provide an example for prefixing all tail output linesPádraig Brady
* doc/coreutils.texi (tail invocation): Provide an example using awk to convert tail ==> file <== headers to file: prefixes on each line. Suggested by Stephen Shirley.
2015-11-23md5sum,sha*sum: add --ignore-missing for checking a subset of filesLuther Thompson
* doc/coreutils.texi (md5sum invocation): Document the new option. * src/md5sum.c (digest_file): Return an empty digest to indicate a missing file. (digest_check): Don't fail or output status given an empty checksum. (usage): Document the new option. (main): Process and validate the new option. * tests/misc/md5sum.pl: Add new test cases. * NEWS: Mention the new feature. Fixes http://bugs.gnu.org/15604
2015-11-21doc: give a tee example for combining process substitution outputsPádraig Brady
This can be useful if you want to further process data from process substitutions. For example: datagen | tee >(md5sum --tag) > >(sha256sum --tag) | sort * doc/coreutils.texi (tee invocation): Mention that -p is useful with pipes that may not consume all data. Add an example, similar to the one above. * THANKS.in: Add Jirka Hladky.
2015-11-04ls: default to --quoting=shell-escape for output to terminalPádraig Brady
* src/ls.c (decode_switches): Set "shell-escape" if isatty(). * doc/coreutils.texi (ls invocation): Update the defaults description. * NEWS: Mention the change in behavior. It should not have backwards compat issues, but mentioning here just in case.
2015-11-04printf: support the %q format to quote for shellPádraig Brady
* src/printf.c (usage): Mention the new format. (print_formatted): Handle the quoting by calling out to the quotearg module with "shell-escape" mode. * doc/coreutils.texi (printf invocation): Document %q. * tests/misc/printf-quote.sh: New test. * tests/local.mk: Reference new test. * NEWS: Mention the new feature.
2015-11-04ls: document and test new shell-escape quotingPádraig Brady
* doc/coreutils.texi (ls invocation): Describe the new 'shell-escape' and 'shell-escape-always' quoting options. * src/ls.c (usage): Mention the new quoting options. * tests/misc/ls-misc.pl: Add a test for 'shell-escape'
2015-11-02doc: fix texinfo for short options taking a parameterPádraig Brady
* doc/coreutils.texi: (tail invocation): Add missing -s, along with the existing --sleep-interval description. (csplit invocation): s/--suffix/--suffix-format/. (head invocation): Use same variable (COUNT) for -n and --head-count. (seq invocation): Add opindex items for all options. (ptx invocation): Likewise. Fix typo s/--flac-truncation/--flag-truncation/. (touch invocation): State explicitly that -d takes a parameter, which also indicates that an '=' is not to be used for the short option syntax. (ls invocation): Likewise for the -w option. Fixes http://bugs.gnu.org/21809
2015-10-28doc: clarify iso-8601 formats used by ls and duPádraig Brady
* doc/coreutils.texi (du invocation): Remove 'like' from mentions of ISO-8601 as the components are individually conformant. (ls invocation): Likewise, except for --time-style=iso for recent files, where the MM-DD component is not a valid ISO-8601 timestamp.
2015-10-27date: use extended format timezone for --iso-8601Pádraig Brady
* src/date.c (main): Use %:z rather than %z with --iso-8601 as the standard states to consistently use extended format. Note either format can be parsed by date. * tests/misc/date.pl: Adjust accordingly. * doc/coreutils.texi (du invocation): Clarify that "iso" time styles are only similar to ISO-8601. (ls invocation): Likewise. (date invocation): Adjust the comment stating that only --rfc-3339 output can be parsed by date(1). * NEWS: Mention the change in behavior. Reported at http://bugs.debian.org/799479
2015-10-21ls: allow -w0 to mean no limit on line lengthPádraig Brady
* src/ls.c (print_with_separator): Renamed from print_with_commas, and parameterized to accept the separator to print. Also fix an edge case where '\n' not printed when the POS variable overflows SIZE_MAX. (print_current_files): Degenerate -x and -C to using the cheaper print_with_separator() in the -w0 case. * doc/coreutils.texi (ls invocation): Document the new feature. * tests/ls/w-option.sh: A new test. * tests/local.mk: Reference the new test. * NEWS: Mention the improvement. Fixes http://bugs.gnu.org/21325
2015-10-19factor: remove unreachable SQUFOF code at compile timePádraig Brady
It was a little confusing as to whether the SQUFOF algorithm was enabled, and in fact there were no options available to enable it. Therefore clarify the 3 configurable behaviors for the code to 3 defines at the top of the program, and only include the SQUFOF code if enabled at compile time. $ size src/factor-before text data bss 93997 1412 2504 $ size src/factor-after text data bss 87885 1404 2504 * src/factor.c: Only include the SQUFOF factor code when enabled via the USE_SQUFOF define. * doc/coreutils.texi (factor invocation): Update note about factor limits, as we can factor 128 bit numbers without GMP.
2015-10-16doc: remove obsolete performance commentPaul Eggert
sha512sum can be faster than sha256sum. E.g., ‘dd if=/dev/zero bs=1024k count=1024 | time sha256sum’ reports 8.16 user CPU seconds on my host, whereas sha512sum consumes 5.45 seconds (Fedora x86-64 on an AMD Phenom II X4 910e). Although sha512sum is still considerably slower on x86, a good chunk of uses are on 64-bit hosts and anyway there’s little point to scaring people away from sha512sum nowadays. * doc/coreutils.texi (sha2 utilities): Remove obsolete comment.
2015-09-17shred: don’t document -NUMBER optionPaul Eggert
The -NUMBER option was removed from ‘shred’ in 1999, but the manual wasn’t updated to match. Problem reported by Nick Rose in: http://bugs.gnu.org/21502 * doc/coreutils.texi (shred invocation): Remove documentation for -NUMBER option.
2015-09-03base32: A new program similar to base64Pádraig Brady
Suggested in https://bugzilla.redhat.com/1250113 * AUTHORS: Add base32. * THANKS.in: Add suggester. * README: Reference the new program. * NEWS: Mention the new program. * src/.gitignore: Ignore the new binary. * bootstrap.conf: Reference the gnulib base32 module. * build-aux/gen-lists-of-programs.sh: Add base32. * man/base32.x: A new template. * man/.gitignore: Ignore the new man page. * man/local.mk: Reference the new man page. * doc/coreutils.texi (base32 invocation): Document the new command. * src/local.mk: Adjust to build base32 based on base64.c. * src/base64.c: Parameterize to use the correct headers, functions and buffer sizes, depending on which binary is being built. * tests/misc/base64.pl: Adjust to test both base32 and base64. * tests/misc/tty-eof.pl: Add base32 as a program that accepts input on stdin without any options specified. * scripts/git-hooks/commit-msg: Add base32 to the template.
2015-08-27doc: clarify where ambiguous if short options take no paramPádraig Brady
* doc/coreutils.texi (split invocation): Clarify that -d takes no param. (uniq invocation): Likewise for -D. (shred invocation): Likewise for -u. (tee invocation): Likewise for -p.
2015-07-22doc: discourage use of uname -i and -p optionsPádraig Brady
* src/uname.c (usage): State that the non POSIX -i and -p options are non-portable. * doc/coreutils.texi (uname invocation): Mention the discrepancies even across GNU/Linux distros, and that the results should be used as informational only, rather than impacting any logic decisions. Fixes http://bugs.gnu.org/13001
2015-07-15tests: avoid test warning with perl >= 5.22Peter Bray
* doc/local.mk (sc-lower-case-var): Escape a literal left curly bracket, needed with perl >= 5.22 Fixes http://bugs.gnu.org/21060
2015-06-22doc: list numfmt in the main menu with "Numeric operations"Pádraig Brady
* doc/coreutils.texi (main menu): Add numfmt.
2015-06-21numfmt: support user specified output precisionPádraig Brady
* src/numfmt.c (usage): Update the --format description to indicate precision is allowed. (parse_format_string): Parse a precision specification like the standard printf does. (double_to_human): Honor the precision in --to mode. * tests/misc/numfmt.pl: New tests. * doc/coreutils.texi (numfmt invocation): Mention the new feature. * NEWS: Likewise.
2015-06-19numfmt: implement support for field rangesDylan Cali
* src/numfmt.c: Replace field handling code with logic that understands field range specifiers. Instead of processing a single field and printing line prefix/suffix around it, process each field in the line checking whether it has been included for conversion. If so convert and print, otherwise just print the unaltered field. (extract_fields): Removed. (skip_fields): Removed. (process_line): Gutted and heavily reworked. (process_suffixed_number): FIELD is now passed as an arg instead of using a global. (parse_field_arg): New function that parses field range specifiers. (next_field): New function that returns pointers to the next field in a line. (process_field): New function that wraps the field conversion logic (include_field): New function that checks whether a field should be converted (compare_field): New function used for field value comparisons in a gl_list. (free_field): New function used for freeing field values in a gl_list. Global variable FIELD removed. New global variable all_fields indicates whether all fields should be processed. New global variable all_fields_after stores the first field of a N- style range. New global variable all_fields_before stores the last field of a -M style range. New global variable field_list stores explicitly specified fields to process (N N,M or N-M style specifiers). (usage): Document newly supported field range specifiers. * bootstrap.conf: Include xlist and linked-list modules. numfmt now uses the gl_linked_list implementation to store the field ranges. * tests/misc/numfmt.pl: Add tests for 'cut style' field ranges. Adjust existing tests as partial output can occur before an error Remove test for the 'invalid' field -5.. this is now a valid range. * gnulib: update to avoid compiler warnings in linked-list. * NEWS: Mention the new feature.
2015-06-19numfmt: handle suffixes consistently with --{from,to}-unitPádraig Brady
* src/numfmt.c (unit_to_umax): Support SI (power of 10) suffixes with the --from-unit and --to-unit options. Treat suffixes like is done with --from=auto, which for example will change the meaning of --to-unit=G to that of --to-unit=Gi. The suffix support was previously undocumented and it's better to avoid the traditional coreutils suffix handling in numfmt by default. * doc/coreutils.texi: Document the new behavior. Also fix a typo mentioning {from,to}=units=. * tests/misc/numfmt.pl: Adjust accordingly. * NEWS: Mention the change in behavior.
2015-05-13timeout: with --foreground don't send SIGCONTPádraig Brady
* src/timeout.c (cleanup): Don't send SIGCONT to the monitored program when --foreground is specified, as it's generally not needed for foreground programs, and can cause intermittent signal delivery issues with monitors like GDB for example. * doc/coreutils.texi (timeout invocation): Mention that SIGCONT is not sent with --foreground. * NEWS: Mention the behavior change.
2015-05-13split: auto set suffix len for --numeric-suffixes=<N --number=NPádraig Brady
Supporting `split --numeric-suffixes=1 -n100` for example. * doc/coreutils.texi (split invocation): Mention the two use cases for the FROM parameter, and the consequences on the suffix length determination. * src/split.c (set_suffix_length): Use the --numeric-suffixes FROM parameter in the suffix width calculation, when it's less than the number of files specified in --number. * tests/split/suffix-auto-length.sh: Add test cases. Fixes http://bugs.gnu.org/20511
2015-05-13doc: clarify the operation of wc -LAssaf Gordon
* src/wc.c (usage): State that it calculates display width. * doc/coreutils.texi (wc invocation): Detail the distinct items used to determine the display width.
2015-04-23doc: fix grammar issue in truncate infoMichael Witten
* doc/coreutils.texi (truncate invocation): The word 'their' is incorrect; 'each file' is the antecedent, and is singular, so 'its' is the correct pronoun.
2015-04-13doc: clarify how cp behaves with default ACLsAndreas Gruenbacher
* doc/coreutils.texi (cp invocation): Mention that when copying files without preserving permissions, the umask or a default ACL affect the mode of new files. * THANKS.in: Remove committer. Related to http://bugs.gnu.org/8527
2015-04-09doc: correct pluralization for mkfifo and mknodMitchel Humpherys
* doc/coreutils.texi: `mkfifo' and `mknod' use the optContext macro which adds a description for the SELinux security context in addition to the single option already described in each case. The result in both cases is two options being introduced as `option' (singular). Fix this by introducing them as `options' (plural).
2015-03-29doc: move numfmt info to the 'Numeric operations' sectionPádraig Brady
* doc/coreutils.texi: Move numfmt info to this section, as numfmt functionality aligns more with seq and factor, than fmt and pr etc.
2015-03-27nohup: clarify stdin redirectionPaul Eggert
Problem reported by Isaac Schwabacher in: http://bugs.gnu.org/20214 * doc/coreutils.texi (nohup invocation): Clarify that when nohup's stdin gets redirected, it's unreadable. * doc/coreutils.texi (nohup invocation): * src/nohup.c (usage): Don't promise /dev/null.
2015-03-04tee: generalize the --write-error option to --output-errorPádraig Brady
Adjust commit v8.23-140-gfdd6ebf to add the --output-error option instead of --write-error, and treat open() errors like write() errors. * doc/coreutils.texi (tee invocation): s/write-error/output-error/. * src/tee.c (main): Exit on open() error if appropriate. * tests/misc/tee.sh: Add a case to test open() errors. * NEWS: Adjust for the more general output error behavior. Suggested by Bernhard Voelker.
2015-02-24tee: add --write-error to control handling of closed pipesPádraig Brady
tee is very often used with pipes and this gives better control when writing to them. There are 3 classes of file descriptors that tee can write to: files(1), pipes(2), and early close pipes(3). Handling write errors to 1 & 2 is supported at present with the caveat that failure writing to any pipe will terminate tee immediately. Handling write errors to type 3 is not currently supported. To improve the supported combinations we add these options: --write-error=warn Warn if error writing any output including pipes. Allows continued writing to still open files/pipes. Exit status is failure if any output had error. --write-error=warn-nopipe, -p Warn if error writing any output except pipes. Allows continued writing to still open files/pipes. Exit status is failure if any non pipe output had error. --write-error=exit Exit if error writing any output including pipes. --write-error=exit-nopipe Exit if error writing any output except pipes. Use the "nopipe" variants when files are of types 1 and 3, otherwise use the standard variants with types 1 and 2. A caveat with the above scheme is that a combination of pipe types (2 & 3) is not supported robustly. I.e. if you use the "nopipe" variants when using both type 2 and 3 pipes, then any "real" errors on type 2 pipes will not be diagnosed. Note also a general issue with type 3 pipes that are not on tee's stdout, is that shell constructs don't allow to distinguish early close from real failures. For example `tee >(head -n1) | grep -m1 ..` can't distinguish between an error or an early close in "head" pipe, while the fail on the grep part of the pipe is distinguished independently from the resulting pipe errors. This is a general issue with the >() construct, rather than with tee itself. * NEWS: Mention the new feature. * doc/coreutils.texi (tee invocation): Describe the new option. * src/tee.c (usage): Likewise. (main): With --write-error ignore SIGPIPE, and handle the various exit, diagnostics combinations. * tests/misc/tee.sh: Tess all the new options. Fixes http://bugs.gnu.org/11540
2015-02-20tee: treat '-' operand as file name as mandated by POSIXBernhard Voelker
Since v5.2.1-1247-g8dafbe5, tee(1) treated '-' as stdout while POSIX explicitly requires to treat this as a file name. Revert this change, as the interleaved output - due to sending another copy of input to stdout - is not considered to be useful. Discussed in http://lists.gnu.org/archive/html/coreutils/2015-02/msg00085.html * src/tee.c (tee_files): Remove the special handling for "-" operands. (usage): Remove the corresponding sentence. * doc/coreutils.texi (common options): Remove the "tee -" example. (tee invocation): Document that tee(1) now treats "-" as a file name. * tests/misc/tee.sh: Add a test case for "tee -". While at it, re-indent the above multi-argument processing case and extend that to 13 operands, as POSIX mandates that, too. * tests/misc/tee-dash.sh: Remove now-obsolete test. * tests/local.mk (all_tests): Remove the above test. * NEWS (Changes in behavior): Mention the change.
2015-02-11build: update to latest gnulibPádraig Brady
This includes a change to require --with-libmount to be used with configure, due to the many libmount dependencies. * bootstrap: Sync with gnulib to exit early on gnulib-tool error. * gl/lib/tempname.c.diff: Adjust for gnulib changes. * gl/lib/tempname.h.diff: Likewise. * gl/modules/tempname: Likewise. * doc/.gitignore: Add new gendocs_template_min gnulib script.
2015-02-11doc: give an example of using a seed for random operationsPádraig Brady
* doc/coreutils.texi (Random sources): Give an example using openssl, generating a reproducible arbitrary amount of randomly distributed data, given a seed value.
2015-01-31doc,maint: fix use of "i.e." in documentation and commentsBernhard Voelker
To align with all other places (and correct grammar), change all upper-case "I.E." to "I.e.". Furthermore, ensure that "i.e." is followed by a comma. Finally, ensure to use a double-space before "I.e.," at the beginning of a sentence. The following was used to change all offending uses (apart from old ChangeLog files): $ git grep -liF 'i.e.' \ | xargs sed -i \ -e 's/I\.E\./I.e./g' \ -e 's/\. \(I\.e\.\)/. \1/g' \ -e 's/\([Ii]\.e\.\)\( \)/\1,\2/g' \ -e 's/\([Ii]\.e\.\)$/\1,/g' * cfg.mk (sc_prohibit_uppercase_id_est): Add new rule. (sc_ensure_double_space_after_dot_before_id_est): Likewise. (sc_ensure_comma_after_id_est): Likewise. (old_NEWS_hash): Refresh hash via "make update-NEWS-hash". * NEWS: Change use of "id est" abbreviation via the above command. * README: Likewise. * README-prereq: Likewise. * doc/coreutils.texi: Likewise. * gl/lib/rand-isaac.c: Likewise. * gl/lib/tempname.c.diff: Likewise. * man/stdbuf.x: Likewise. * src/cat.c: Likewise. * src/copy.c: Likewise. * src/copy.h: Likewise. * src/cp.c: Likewise. * src/cut.c: Likewise. * src/dd.c: Likewise. * src/df.c: Likewise. * src/fiemap.h: Likewise. * src/longlong.h: Likewise. * src/ls.c: Likewise. * src/numfmt.c: Likewise. * src/pr.c: Likewise. * src/shred.c: Likewise. * src/shuf.c: Likewise. * src/split.c: Likewise. * tests/Coreutils.pm: Likewise. * tests/df/df-symlink.sh: Likewise. * tests/df/skip-rootfs.sh: Likewise. * tests/init.sh: Likewise. * tests/ls/color-norm.sh: Likewise. * tests/misc/basename.pl: Likewise. * tests/misc/ls-misc.pl: Likewise. * tests/misc/md5sum-bsd.sh: Likewise. * tests/misc/shred-exact.sh: Likewise. * tests/misc/sort.pl: Likewise. * tests/misc/stdbuf.sh: Likewise. * tests/misc/tac-continue.sh: Likewise. * tests/rm/r-root.sh: Likewise. * tests/tail-2/symlink.sh: Likewise.
2015-01-29doc: clarify the output format for the *sum utilitiesPádraig Brady
* src/md5sum.c (usage): Detail the reasons for the default double space between checksum and file name. * doc/coreutils.texi (md5sum invocation): Likewise. Explicitly mention the 3 formats that --check supports. Fixes http://bugs.gnu.org/19725
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