150 lines
6.0 KiB
Plaintext
150 lines
6.0 KiB
Plaintext
Version 2.4:
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- egrep is now equivalent to `grep -E' as required by POSIX,
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removing a longstanding source of confusion and incompatibility.
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`grep' is now more forgiving about stray `{'s, for backward
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compatibility with traditional egrep.
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- The lower bound of an interval is not optional.
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You must use an explicit zero, e.g. `x{0,10}' instead of `x{,10}'.
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(The old documentation incorrectly claimed that it was optional.)
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- The --revert-match option has been renamed to --invert-match.
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- The --fixed-regexp option has been renamed to --fixed-string.
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- New option -H or --with-filename.
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- New option --mmap. By default, GNU grep now uses read instead of mmap.
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This is faster on some hosts, and is safer on all.
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- The new option -z or --null-data causes `grep' to treat a zero byte
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(the ASCII NUL character) as a line terminator in input data, and
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to treat newlines as ordinary data.
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- The new option -Z or --null causes `grep' to output a zero byte
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instead of the normal separator after a file name.
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- These two options can be used with commands like `find -print0',
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`perl -0', `sort -z', and `xargs -0' to process arbitrary file names,
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even those that contain newlines.
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- The environment variable GREP_OPTIONS specifies default options;
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e.g. GREP_OPTIONS='--directories=skip' reestablishes grep 2.1's
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behavior of silently skipping directories.
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- You can specify a matcher multiple times without error, e.g.
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`grep -E -E' or `fgrep -F'. It is still an error to specify
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conflicting matchers.
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- -u and -U are now allowed on non-DOS hosts, and have no effect.
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- Modifications of the tests scripts to go around the "Broken Pipe"
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errors from bash. See Bash FAQ.
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- New option -r or --recursive or --directories=recurse.
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(This option was also in grep 2.3, but wasn't announced here.)
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- --without-included-regex disable, was causing bogus reports .i.e
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doing more harm then good.
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Version 2.3:
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- When searching a binary file FOO, grep now just reports
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`Binary file FOO matches' instead of outputting binary data.
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This is typically more useful than the old behavior,
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and it is also more consistent with other utilities like `diff'.
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A file is considered to be binary if it contains a NUL (i.e. zero) byte.
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The new -a or --text option causes `grep' to assume that all
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input is text. (This option has the same meaning as with `diff'.)
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Use it if you want binary data in your output.
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- `grep' now searches directories just like ordinary files; it no longer
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silently skips directories. This is the traditional behavior of
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Unix text utilities (in particular, of traditional `grep').
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Hence `grep PATTERN DIRECTORY' should report
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`grep: DIRECTORY: Is a directory' on hosts where the operating system
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does not permit programs to read directories directly, and
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`grep: DIRECTORY: Binary file matches' (or nothing) otherwise.
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The new -d ACTION or --directories=ACTION option affects directory handling.
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`-d skip' causes `grep' to silently skip directories, as in grep 2.1;
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`-d read' (the default) causes `grep' to read directories if possible,
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as in earlier versions of grep.
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- The MS-DOS and Microsoft Windows ports now behave identically to the
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GNU and Unix ports with respect to binary files and directories.
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Version 2.2:
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Bug fix release.
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- Status error number fix.
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- Skipping directories removed.
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- Many typos fix.
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- -f /dev/null fix(not to consider as an empty pattern).
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- Checks for wctype/wchar.
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- -E was using the wrong matcher fix.
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- bug in regex char class fix
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- Fixes for DJGPP
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Version 2.1:
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This is a bug fix release(see Changelog) i.e. no new features.
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- More compliance to GNU standard.
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- Long options.
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- Internationalisation.
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- Use automake/autoconf.
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- Directory hierarchy change.
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- Sigvec with -e on Linux corrected.
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- Sigvec with -f on Linux corrected.
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- Sigvec with the mmap() corrected.
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- Bug in kwset corrected.
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- -q, -L and -l stop on first match.
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- New and improve regex.[ch] from Ulrich Drepper.
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- New and improve dfa.[ch] from Arnold Robbins.
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- Prototypes for over zealous C compiler.
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- Not scanning a file, if it's a directory
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(cause problems on Sun).
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- Ported to MS-DOS/MS-Windows with DJGPP tools.
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See Changelog for the full story and proper credits.
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Version 2.0:
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The most important user visible change is that egrep and fgrep have
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disappeared as separate programs into the single grep program mandated
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by POSIX 1003.2. New options -G, -E, and -F have been added,
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selecting grep, egrep, and fgrep behavior respectively. For
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compatibility with historical practice, hard links named egrep and
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fgrep are also provided. See the manual page for details.
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In addition, the regular expression facilities described in Posix
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draft 11.2 are now supported, except for internationalization features
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related to locale-dependent collating sequence information.
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There is a new option, -L, which is like -l except it lists
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files which don't contain matches. The reason this option was
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added is because '-l -v' doesn't do what you expect.
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Performance has been improved; the amount of improvement is platform
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dependent, but (for example) grep 2.0 typically runs at least 30% faster
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than grep 1.6 on a DECstation using the MIPS compiler. Where possible,
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grep now uses mmap() for file input; on a Sun 4 running SunOS 4.1 this
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may cut system time by as much as half, for a total reduction in running
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time by nearly 50%. On machines that don't use mmap(), the buffering
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code has been rewritten to choose more favorable alignments and buffer
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sizes for read().
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Portability has been substantially cleaned up, and an automatic
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configure script is now provided.
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The internals have changed in ways too numerous to mention.
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People brave enough to reuse the DFA matcher in other programs
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will now have their bravery amply "rewarded", for the interface
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to that file has been completely changed. Some changes were
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necessary to track the evolution of the regex package, and since
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I was changing it anyway I decided to do a general cleanup.
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