| 1 | Copyright (C) 1992, 1997-2002, 2004-2021 Free Software Foundation, Inc.
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| 2 |
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| 3 | Copying and distribution of this file, with or without modification,
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| 4 | are permitted in any medium without royalty provided the copyright
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| 5 | notice and this notice are preserved.
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| 6 |
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| 7 | This is GNU grep, the "fastest grep in the west" (we hope). All
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| 8 | bugs reported in previous releases have been fixed. Many exciting new
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| 9 | bugs have probably been introduced in this revision.
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| 10 |
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| 11 | GNU grep is provided "as is" with no warranty. The exact terms
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| 12 | under which you may use and (re)distribute this program are detailed
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| 13 | in the GNU General Public License, in the file COPYING.
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| 14 |
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| 15 | GNU grep is based on a fast lazy-state deterministic matcher (about
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| 16 | twice as fast as stock Unix egrep) hybridized with a Boyer-Moore-Gosper
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| 17 | search for a fixed string that eliminates impossible text from being
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| 18 | considered by the full regexp matcher without necessarily having to
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| 19 | look at every character. The result is typically many times faster
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| 20 | than Unix grep or egrep. (Regular expressions containing back-references
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| 21 | will run more slowly, however.)
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| 22 |
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| 23 | See the files AUTHORS and THANKS for a list of authors and other contributors.
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| 24 |
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| 25 | See the file INSTALL for compilation and installation instructions.
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| 26 | If there is no INSTALL file, this copy of the source code is intended
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| 27 | for expert hackers; please see the file README-hacking.
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| 28 |
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| 29 | See the file NEWS for a description of major changes in this release.
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| 30 |
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| 31 | See the file TODO for ideas on how you could help us improve grep.
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| 32 |
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| 33 | See the file README-alpha for information on grep development and the CVS
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| 34 | repository.
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| 35 |
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| 36 | Send bug reports to bug-grep@gnu.org.
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| 37 |
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| 38 | KNOWN BUGS:
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| 39 |
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| 40 | Several tests in fmbtest.sh and foad1.sh fail under the cs_CZ.UTF-8 locale
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| 41 | and have been disabled.
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| 42 |
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| 43 | The combination of -o and -i options is broken and the known failing cases
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| 44 | are disabled in foad1.sh
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| 45 |
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| 46 | The option -i does not work properly in some multibyte locales such as
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| 47 | tr_TR.UTF-8 where the upper case and lower case forms of a character are not
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| 48 | necessarily of the same byte length.
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| 49 |
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| 50 | A list of outstanding and resolved bugs can be found at:
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| 51 |
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| 52 | https://debbugs.gnu.org/cgi/pkgreport.cgi?package=grep
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| 53 |
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| 54 | You can also browse the bug-grep mailing list archive at:
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| 55 |
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| 56 | https://lists.gnu.org/r/bug-grep/
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| 57 |
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| 58 | For any copyright year range specified as YYYY-ZZZZ in this package
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| 59 | note that the range specifies every single year in that closed interval.
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