| [2557] | 1 | Version 2.5.1
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| 2 | - This is a bugfix release. No new features.
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| 3 |
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| 4 | Version 2.5
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| 5 | - The new option --label allows to specify a different name for input
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| 6 | from stdin. See the man or info pages for details.
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| 7 |
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| 8 | - The internal lib/getopt* files are no longer used on systems providing
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| 9 | getopt functionality in their libc (e.g. glibc 2.2.x).
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| 10 | If you need the old getopt files, use --with-included-getopt.
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| 11 |
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| 12 | - The new option --only-matching (-o) will print only the part of matching
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| 13 | lines that matches the pattern. This is useful, for example, to extract
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| 14 | IP addresses from log files.
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| 15 |
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| 16 | - i18n bug fixed ([A-Z0-9] wouldn't match A in locales other than C on
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| 17 | systems using recent glibc builds
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| 18 |
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| 19 | - GNU grep can now be built with autoconf 2.52.
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| 20 |
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| 21 | - The new option --devices controls how grep handles device files. Its usage
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| 22 | is analogous to --directories.
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| 23 |
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| 24 | - The new option --line-buffered fflush on everyline. There is a noticeable
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| 25 | slow down when forcing line buffering.
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| 26 |
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| 27 | - Back references are now local to the regex.
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| 28 | grep -e '\(a\)\1' -e '\(b\)\1'
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| 29 | The last backref \1 in the second expression refer to \(b\)
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| 30 |
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| 31 | - The new option --include=PATTERN will only search matching files
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| 32 | when recursing in directories
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| 33 |
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| 34 | - The new option --exclude=PATTERN will skip matching files when
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| 35 | recursing in directories.
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| 36 |
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| 37 | - The new option --color will use the environment variable GREP_COLOR
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| 38 | (default is red) to highlight the matching string.
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| 39 | --color takes an optional argument specifying when to colorize a line:
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| 40 | --color=always, --color=tty, --color=never
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| 41 |
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| 42 | - The following changes are for POSIX.2 conformance:
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| 43 |
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| 44 | . The -q or --quiet or --silent option now causes grep to exit
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| 45 | with zero status when a input line is selected, even if an error
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| 46 | also occurs.
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| 47 |
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| 48 | . The -s or --no-messages option no longer affects the exit status.
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| 49 |
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| 50 | . Bracket regular expressions like [a-z] are now locale-dependent.
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| 51 | For example, many locales sort characters in dictionary order,
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| 52 | and in these locales the regular expression [a-d] is not
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| 53 | equivalent to [abcd]; it might be equivalent to [aBbCcDd], for
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| 54 | example. To obtain the traditional interpretation of bracket
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| 55 | expressions, you can use the C locale by setting the LC_ALL
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| 56 | environment variable to the value "C".
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| 57 |
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| 58 | - The -C or --context option now requires an argument, partly for
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| 59 | consistency, and partly because POSIX.2 recommends against
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| 60 | optional arguments.
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