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Copyright (C) 1992, 1997-2002, 2004-2025 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
Mike Haertel wrote the main program and the dfa and kwset matchers.
Isamu Hasegawa wrote the POSIX regular expression matcher, which is
part of the GNU C Library and is distributed as part of GNU grep for
use on non-GNU systems. Ulrich Drepper, Paul Eggert, Paolo Bonzini,
Stanislav Brabec, Assaf Gordon, Jakub Jelinek, Jim Meyering, Arnold
Robbins, Andreas Schwab and Florian Weimer also contributed to this
matcher.
Arthur David Olson contributed the heuristics for finding fixed substrings
at the end of dfa.c.
Henry Spencer wrote the original test suite from which grep's was derived.
Scott Anderson invented the Khadafy test.
David MacKenzie wrote the automatic configuration software used to
produce the configure script.
Authors of the replacements for standard library routines are identified
in the corresponding source files.
The idea of using Boyer-Moore type algorithms to quickly filter out
non-matching text before calling the regexp matcher was originally due
to James Woods. He also contributed some code to early versions of
GNU grep.
Mike Haertel would like to thank Andrew Hume for many fascinating
discussions of string searching issues over the years. Hume and
Sunday's excellent paper on fast string searching describes some of
the history of the subject, as well as providing exhaustive
performance analysis of various implementation alternatives.
The inner loop of GNU grep is similar to Hume & Sunday's recommended
"Tuned Boyer Moore" inner loop (see the Hume & Sunday citation in
the grep manual's "Performance" chapter).
Arnold Robbins contributed to improve dfa.[ch]. In fact
it came straight from gawk-3.0.3 with small editing and fixes.
Norihiro Tanaka contributed many performance improvements and other
fixes, particularly to multi-byte matchers.
Paul Eggert contributed support for recursive grep, as well as several
performance improvements such as searching file holes efficiently.
Many other folks contributed. See THANKS; if someone is omitted
please file a bug report.
Alain Magloire maintained GNU grep until version 2.5e.
Bernhard "Bero" Rosenkränzer <bero@arklinux.org> maintained GNU grep until
version 2.5.1, ie. from Sep 2001 till 2003.
Stepan Kasal <kasal@ucw.cz> maintained GNU grep since Feb 2004.
Tony Abou-Assaleh <taa@acm.org> maintains GNU grep since Oct 2007.
Jim Meyering <jim@meyering.net> and Paolo Bonzini <bonzini@gnu.org>
began maintaining GNU grep in Nov 2009. Paolo bowed out in 2012.
;; Local Variables:
;; coding: utf-8
;; End:

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SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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These people have contributed to the GNU grep. Those contributions are
described in the version control logs. If your name has been left out,
if you'd rather not be listed, or if you'd prefer a different address
be used, please send a note to the bug-report mailing list (as seen at
end of e.g., grep --help).
Adam Katz savannah@kopis.com
Aharon Robbins arnold@skeeve.com
Akim Demaille akim@epita.fr
Alain Magloire alainm@rcsm.ee.mcgill.ca
Allan McRae allan@archlinux.org
Andreas Ley andy@rz.uni-karlsruhe.de
Andreas Schwab schwab@suse.de
Anton Samokat samokat700@gmail.com
Arnold D. Robbins arnold@skeeve.com
Arnold Robbins arnold@skeeve.com
Barret Rhoden brho@cs.berkeley.edu
Bastiaan "Darquan" Stougie darquan@zonnet.nl
behoffski behoffski@grouse.com.au
Ben Elliston bje@cygnus.com
Benno Schulenberg bensberg@justemail.net
Bernd Strieder strieder@student.uni-kl.de
Bernhard Rosenkraenzer bero@arklinux.org
Bernhard Voelker mail@bernhard-voelker.de
Bob Proulx rwp@hprwp.fc.hp.com
Brian Youmans 3diff@gnu.org
Bruno Haible bruno@clisp.org
Carlo Marcelo Arenas Belón carenas@gmail.com
Charles Levert charles_levert@gna.org
Christian Boltz grep-bug@cboltz.de
Christian Groessler cpg@aladdin.de
Collin Funk collin.funk1@gmail.com
Corinna Vinschen vinschen@redhat.com
Dagobert Michelsen dam@opencsw.org
Daisuke GOTO gotoh@m-design.com
Dave Reisner d@falconindy.com
David Clissold cliss@austin.ibm.com
David J MacKenzie djm@catapult.va.pubnix.com
David O'Brien obrien@freebsd.org
Dmitry V. Levin ldv@altlinux.org
'Drake' Daham Wang drakewang@gmail.com
Egmont Koblinger egmont@gmail.com
Eli Zaretskii eliz@gnu.org
Emanuele Torre torreemanuele6@gmail.com
Eric Blake eblake@redhat.com
Fernando Basso fernandobasso.br@gmail.com
Florian La Roche laroche@redhat.com
François Pinard pinard@iro.umontreal.ca
Gerald Stoller gerald_stoller@hotmail.com
Grant McDorman grant@isgtec.com
Greg Boyd gboyd.ccsf@gmail.com
Greg Louis glouis@dynamicro.on.ca
Grisha Levit grishalevit@gmail.com
Gro-Tsen https://twitter.com/gro_tsen
Guglielmo 'bond' Bondioni g.bondioni@libero.it
H. Merijn Brand h.m.brand@hccnet.nl
Hans-Bernhard Broeker broeker@physik.rwth-aachen.de
Harald Hanche-Olsen hanche@math.ntnu.no
Heikki Korpela heko@iki.fi
Helge Kreutzmann debian@helgefjell.de
Igor O. Ladygin assa@zabtrans.ru
Ilya Basin basinilya@gmail.com
Isamu Hasegawa isamu@yamato.ibm.com
Jaroslav Škarvada jskarvad@redhat.com
Javier Villavicencio the_paya@gentoo.org
Jeff Bailey jbailey@nisa.net
Jim Hand jhand@austx.tandem.com
Jim Meyering jim@meyering.net
Jim Meyering meyering@meta.com
Jochen Hein jochen.hein@delphi.central.de
Joel N. Weber II devnull@gnu.org
Johan Walles johan.walles@gmail.com
John Hughes john@nitelite.calvacom.fr
Jorge Stolfi stolfi@dcc.unicamp.br
Josh Soref jsoref@gmail.com
Juan Manuel Guerrero juan.guerrero@gmx.de
Julian Foad julianfoad@btopenworld.com
Karl Berry karl@gnu.org
Karl Heuer kwzh@gnu.org
Karl Pettersson karl.pettersson@klpn.se
Kaveh R. Ghazi ghazi@caip.rutgers.edu
Kazuro Furukawa furukawa@apricot.kek.jp
Keith Bostic bostic@bsdi.com
Kevin Locke kevin@kevinlocke.name
Koen Claessen koen@chalmers.se
Krishna Sethuraman krishna@sgihub.corp.sgi.com
Kurt D Schwehr kdschweh@insci14.ucsd.edu
Ludovic Courtès ludo@gnu.org
Marc Aldorasi m101010a@gmail.com
Marek Suppa mr@shu.io
Mark Veltzer mark.veltzer@gmail.com
Mark Waite markw@mddmew.fc.hp.com
Martin P.J. Zinser zinser@decus.de
Martin Rex martin.rex@sap-ag.de
Mateusz Okulus mmokulus@gmail.com
Matthew Burgess matthew@linuxfromscratch.org
Michael Aichlmayr mikla@nx.com
Mike Frysinger vapier@gentoo.org
Mike Haertel mike@ducky.net
Miles Bader miles@ccs.mt.nec.co.jp
Mirraz Mirraz mirraz1@rambler.ru
Nelson H. F. Beebe beebe@math.utah.edu
Nicolas Vigier boklm@mars-attacks.org
Nima Aghdaii naghdaii@fb.com
Norihiro Tanaka noritnk@kcn.ne.jp
Olaf Kirch okir@ns.lst.de
Ondřej Fiala temp.xanomes@volny.cz
Pádraig Brady P@draigBrady.com
Paolo Bonzini bonzini@gnu.org
Patrick Boyd pboyd04@gmail.com
Paul Eggert eggert@cs.ucla.edu
Paul Kimoto kimoto@spacenet.tn.cornell.edu
Péter Radics mitchnull@gmail.com
Petr Písař petr.pisar@atlas.cz
Petr Pisar ppisar@redhat.com
Philip Hazel ph10@cus.cam.ac.uk
Philipp Kohlbecher xt28@gmx.de
Philippe Defert Philippe.Defert@cern.ch
Philippe De Muyter phdm@info.ucl.ac.be
Phillip C. Brisco phillip.craig.brisco@ccmail.census.gov
Rainer Orth ro@cebitec.uni-bielefeld.de
Reuben Thomas rrt@sc3d.org
Roland Roberts rroberts@muller.com
Ruslan Ermilov ru@freebsd.org
Santiago Ruano Rincón santiago@debian.org
Santiago Vila sanvila@unex.es
Sebastian Carlos sebaaa1754@gmail.com
Shannon Hill hill@synnet.com
Sotiris Vassilopoulos Sotiris.Vassilopoulos@betatech.gr
Standish Parsley adsspamtrap01@yahoo.com
Stefano Lattarini stefano.lattarini@gmail.com
Stepan Kasal kasal@ucw.cz
Stephan T. Lavavej stl@nuwen.net
Stephane Chazelas stephane.chazelas@gmail.com
Stewart Levin stew@sep.stanford.edu
Strahinja Kustudic kustodian@gmail.com
Sven Joachim svenjoac@gmx.de
Sydoruk Stepan step@unitex.kiev.ua
Tapani Tarvainen tt@mit.jyu.fi
Tim Waugh twaugh@redhat.com
Tom 'moof' Spindler dogcow@ccs.neu.edu
Tom Tromey tromey@creche.cygnus.com
Tony Abou-Assaleh taa@acm.org
UEBAYASHI Masao masao@nf.enveng.titech.ac.jp
Ulrich Drepper drepper@cygnus.com
Ulrich Eckhardt ulrich.eckhardt@base-42.de
Uwe H. Steinfeld usteinfeld@gmx.net
Volker Borchert bt@teknon.de
Wichert Akkerman wichert@cistron.nl
William Bader william@nscs.fast.net
Wolfgang Schludi schludi@syscomp.de
Yuliy Pisetsky ypisetsky@fb.com
Zev Weiss zev@bewilderbeest.net
Zoltan Herczeg hzmester@freemail.hu
;; Local Variables:
;; coding: utf-8
;; End:

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Things to do for GNU grep
Copyright (C) 1992, 1997-2002, 2004-2025 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
===============
Short term work
===============
See where we are with UTF-8 performance.
Merge Debian patches that seem relevant.
Go through patches in Savannah.
Fix --directories=read.
Write better Texinfo documentation for grep. The manual page would be a
good place to start, but Info documents are also supposed to contain a
tutorial and examples.
Some tests in tests/spencer2.tests should have failed! Need to filter out
some bugs in dfa.[ch]/regex.[ch].
Multithreading?
GNU grep originally did 32-bit arithmetic. Although it has moved to
64-bit on 64-bit platforms by using types like ptrdiff_t and size_t,
this conversion has not been entirely systematic and should be checked.
Lazy dynamic linking of the PCRE library.
Check FreeBSD’s integration of zgrep (-Z) and bzgrep (-J) in one
binary. Is there a possibility of doing even better by automatically
checking the magic of binary files ourselves (0x1F 0x8B for gzip, 0x1F
0x9D for compress, and 0x42 0x5A 0x68 for bzip2)? Once what to do with
the PCRE library is decided, do the same for libz and libbz2.
===================
Matching algorithms
===================
Take a look at these and consider opportunities for merging or cloning:
-- http://osrd.org/projects/grep/global-regular-expression-print-tools-grep-variants
-- ja-grep’s mlb2 patch (Japanese grep)
<http://distcache.freebsd.org/ports-distfiles/grep-2.4.2-mlb2.patch.gz>
-- lgrep (from lv, a Powerful Multilingual File Viewer / Grep)
<http://www.mt.cs.keio.ac.jp/person/narita/lv/>;
-- cgrep (Context grep) <https://awgn.github.io/cgrep/>
seems like nice work;
-- sgrep (Struct grep) <https://www.cs.helsinki.fi/u/jjaakkol/sgrep.html>;
-- agrep (Approximate grep) <https://www.tgries.de/agrep/>,
from glimpse;
-- nr-grep (Nondeterministic reverse grep)
<https://www.dcc.uchile.cl/~gnavarro/software/>;
-- ggrep (Grouse grep) <http://www.grouse.com.au/ggrep/>;
-- freegrep <https://github.com/howardjp/freegrep>;
Check some new algorithms for matching. See, for example, Faro &
Lecroq (cited in kwset.c).
Fix the DFA matcher to never use exponential space. (Fortunately, these
cases are rare.)
============================
Standards: POSIX and Unicode
============================
For POSIX compliance issues, see POSIX 1003.1.
Current support for the POSIX [= =] and [. .] constructs is limited to
platforms whose regular expression matchers are sufficiently
compatible with the GNU C library so that the --without-included-regex
option of ‘configure’ is in effect. Extend this support to non-glibc
platforms, where --with-included-regex is in effect, by modifying the
included version of the regex code to defer to the native version when
handling [= =] and [. .].
For Unicode, interesting things to check include the Unicode Standard
<https://www.unicode.org/standard/standard.html> and the Unicode Technical
Standard #18 (<https://www.unicode.org/reports/tr18/> “Unicode Regular
Expressions”). Talk to Bruno Haible who’s maintaining GNU libunistring.
See also Unicode Standard Annex #15 (<https://www.unicode.org/reports/tr15/>
“Unicode Normalization Forms”), already implemented by GNU libunistring.
In particular, --ignore-case needs to be evaluated against the standards.
We may want to deviate from POSIX if Unicode provides better or clearer
semantics.
POSIX and --ignore-case
-----------------------
For this issue, interesting things to check in POSIX include the
Open Group Base Specifications, Chapter “Regular Expressions”, in
particular Section “Regular Expression General Requirements” and its
paragraph about caseless matching (this may not have been fully
thought through and that this text may be self-contradicting
[specifically: “of either data or patterns” versus all the rest]).
See:
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_02
In particular, consider the following with POSIX’s approach to case
folding in mind. Assume a non-Turkic locale with a character
repertoire reduced to the following various forms of “LATIN LETTER I”:
0049;LATIN CAPITAL LETTER I;Lu;0;L;;;;;N;;;;0069;
0069;LATIN SMALL LETTER I;Ll;0;L;;;;;N;;;0049;;0049
0130;LATIN CAPITAL LETTER I WITH DOT ABOVE;Lu;0;L;0049 0307;;;;N;\
LATIN CAPITAL LETTER I DOT;;;0069;
0131;LATIN SMALL LETTER DOTLESS I;Ll;0;L;;;;;N;;;0049;;0049
UTF-8 octet lengths differ between U+0049 (0x49) and U+0069 (0x69)
versus U+0130 (0xC4 0xB0) and U+0131 (0xC4 0xB1). This implies that
whole UTF-8 strings cannot be case-converted in place, using the same
memory buffer, and that the needed octet-size of the new buffer cannot
merely be guessed (although there’s a simple upper bound of five times
the size of the input, as the longest UTF-8 encoding of any character
is five bytes).
We have
lc(I) = i, uc(I) = I
lc(i) = i, uc(i) = I
lc(İ) = i, uc(İ) = İ
lc(ı) = ı, uc(ı) = I
where lc() and uc() denote lower-case and upper-case conversions.
There are several candidate --ignore-case logics. Using the
if (lc(input_wchar) == lc(pattern_wchar))
logic leads to the following matches:
\in I i İ ı
pat\ ----------
I | Y Y Y n
i | Y Y Y n
İ | Y Y Y n
ı | n n n Y
There is a lack of symmetry between CAPITAL and SMALL LETTERs with
this. Using the
if (uc(input_wchar) == uc(pattern_wchar))
logic (which is what GNU grep currently does although this is not
documented or guaranteed in the future), leads to the following
matches:
\in I i İ ı
pat\ ----------
I | Y Y n Y
i | Y Y n Y
İ | n n Y n
ı | Y Y n Y
There is a lack of symmetry between CAPITAL and SMALL LETTERs with
this.
Using the
if (lc(input_wchar) == lc(pattern_wchar)
|| uc(input_wchar) == uc(pattern_wchar))
logic leads to the following matches:
\in I i İ ı
pat\ ----------
I | Y Y Y Y
i | Y Y Y Y
İ | Y Y Y n
ı | Y Y n Y
There is some elegance and symmetry with this. But there are
potentially two conversions to be made per input character. If the
pattern is pre-converted, two copies of it need to be kept and used in
a mutually coherent fashion.
Using the
if (input_wchar == pattern_wchar
|| lc(input_wchar) == pattern_wchar
|| uc(input_wchar) == pattern_wchar)
logic (a plausible interpretation of POSIX) leads to the following
matches:
\in I i İ ı
pat\ ----------
I | Y Y n Y
i | Y Y Y n
İ | n n Y n
ı | n n n Y
There is a different CAPITAL/SMALL symmetry with this. But there’s
also a loss of pattern/input symmetry that’s unique to it. Also there
are potentially two conversions to be made per input character.
Using the
if (lc(uc(input_wchar)) == lc(uc(pattern_wchar)))
logic leads to the following matches:
\in I i İ ı
pat\ ----------
I | Y Y Y Y
i | Y Y Y Y
İ | Y Y Y Y
ı | Y Y Y Y
This shows total symmetry and transitivity (at least in this example
analysis). There are two conversions to be made per input character,
but support could be added for having a single straight mapping
performing a composition of the two conversions.
Any optimization in the implementation of each logic must not change
its basic semantic.
Unicode and --ignore-case
-------------------------
For this issue, interesting things to check in Unicode include:
- The Unicode Standard, Chapter 3
(<https://www.unicode.org/versions/Unicode9.0.0/ch03.pdf>
“Conformance”), Section 3.13 (“Default Case Algorithms”) and the
toCasefold() case conversion operation.
- The Unicode Standard, Chapter 4
(<https://www.unicode.org/versions/Unicode9.0.0/ch04.pdf>
“Character Properties”), Section 4.2 (“Case”) and
the <https://www.unicode.org/Public/UNIDATA/SpecialCasing.txt>
SpecialCasing.txt and
<https://www.unicode.org/Public/UNIDATA/CaseFolding.txt>
CaseFolding.txt files.
- The Unicode Standard, Chapter 5
(<https://www.unicode.org/versions/Unicode9.0.0/ch05.pdf>
“Implementation Guidelines”), Section 5.18 (“Case Mappings”),
Subsection “Caseless Matching”.
- The Unicode case charts <https://www.unicode.org/charts/case/>.
Unicode uses the
if (toCasefold(input_wchar_string) == toCasefold(pattern_wchar_string))
logic for caseless matching. Consider the “LATIN LETTER I” example
mentioned above. In a non-Turkic locale, simple case folding yields
toCasefold_simple(U+0049) = U+0069
toCasefold_simple(U+0069) = U+0069
toCasefold_simple(U+0130) = U+0130
toCasefold_simple(U+0131) = U+0131
which leads to the following matches:
\in I i İ ı
pat\ ----------
I | Y Y n n
i | Y Y n n
İ | n n Y n
ı | n n n Y
This is different from anything so far!
In a non-Turkic locale, full case folding yields
toCasefold_full(U+0049) = U+0069
toCasefold_full(U+0069) = U+0069
toCasefold_full(U+0130) = <U+0069, U+0307>
toCasefold_full(U+0131) = U+0131
with
0307;COMBINING DOT ABOVE;Mn;230;NSM;;;;;N;NON-SPACING DOT ABOVE;;;;
which leads to the following matches:
\in I i İ ı
pat\ ----------
I | Y Y * n
i | Y Y * n
İ | n n Y n
ı | n n n Y
This is just sad!
Having toCasefold(U+0131), simple or full, map to itself instead of
U+0069 is in contradiction with the rules of Section 5.18 of the
Unicode Standard since toUpperCase(U+0131) is U+0049. Same thing for
toCasefold_simple(U+0130) since toLowerCase(U+0131) is U+0069. The
justification for the weird toCasefold_full(U+0130) mapping is
unknown; it doesn’t even make sense to add a dot (U+0307) to a letter
that already has one (U+0069). It would have been so simple to put
them all in the same equivalence class!
Otherwise, also consider the following problem with Unicode’s approach
on case folding in mind. Assume that we want to perform
echo 'AßBC' | grep -i 'Sb'
which corresponds to
input: U+0041 U+00DF U+0042 U+0043 U+000A
pattern: U+0053 U+0062
Following CaseFolding.txt, applying the toCasefold() transformation to
these yields
input: U+0061 U+0073 U+0073 U+0062 U+0063 U+000A
pattern: U+0073 U+0062
so, according to this approach, the input should match the pattern.
As long as the original input line is to be reported to the user as a
whole, there is no problem (from the user’s point-of-view;
implementation is complicated by this).
However, consider both these GNU extensions:
echo 'AßBC' | grep -i --only-matching 'Sb'
echo 'AßBC' | grep -i --color=always 'Sb'
What is to be reported in these cases, since the match begins in the
*middle* of the original input character ‘ß’?
Unicode’s toCasefold() cannot be implemented in terms of POSIX’s
towctrans() since that can only return a single wint_t value per input
wint_t value.

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Copyright (C) 1992, 1997-2002, 2004-2025 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
This is GNU grep, the "fastest grep in the west" (we hope). All
bugs reported in previous releases have been fixed. Many exciting new
bugs have probably been introduced in this revision.
GNU grep is provided "as is" with no warranty. The exact terms
under which you may use and (re)distribute this program are detailed
in the GNU General Public License, in the file COPYING.
GNU grep is based on a fast lazy-state deterministic matcher
hybridized with Boyer-Moore and Aho-Corasick searches for fixed
strings that eliminate impossible text from being considered by the
full regexp matcher without necessarily having to look at every
character. The result is typically many times faster than traditional
implementations. (Regular expressions containing back-references will
run more slowly, however.)
See the files AUTHORS and THANKS for a list of authors and other contributors.
See the file INSTALL for compilation and installation instructions.
If there is no INSTALL file, this copy of the source code is intended
for expert hackers; please see the file README-hacking.
See the file NEWS for a description of major changes in this release.
See the file TODO for ideas on how you could help us improve grep.
See the file README-alpha for information on grep development and the CVS
repository.
Send bug reports to bug-grep@gnu.org.
KNOWN BUGS:
Several tests in fmbtest.sh and foad1.sh fail under the cs_CZ.UTF-8 locale
and have been disabled.
The combination of -o and -i options is broken and the known failing cases
are disabled in foad1.sh
The option -i does not work properly in some multibyte locales such as
tr_TR.UTF-8 where the upper case and lower case forms of a character are not
necessarily of the same byte length.
A list of outstanding and resolved bugs can be found at:
https://debbugs.gnu.org/cgi/pkgreport.cgi?package=grep
You can also browse the bug-grep mailing list archive at:
https://lists.gnu.org/r/bug-grep/
For any copyright year range specified as YYYY-ZZZZ in this package
note that the range specifies every single year in that closed interval.