What's New:
Sed 4.2.2

* don't misbehave (truncate input) for lines of length 2^31 and longer

* fix endless loop on incomplete multibyte sequences

* -u also does unbuffered input, rather than unbuffered output only

* New command `F' to print current input file name

* sed -i, s///w, and the `w' and `W' commands also obey the --binary option
  (and create CR/LF-terminated files if the option is absent)

* --posix fails for scripts (or fragments as passed to the -e option) that
  end in a backslash, as they are not portable.

* New option -z (--null-data) to separate lines by ASCII NUL characters.

* \x26 (and similar escaped sequences) produces a literal & in the
  replacement argument of the s/// command, rather than including the
  matched text.

----------------------------------------------------------------------------
Sed 4.2.1

* fix parsing of s/[[[[[[[[[]//

* security contexts are preserved by -i too under SELinux

* temporary files for sed -i are not made group/world-readable until
  they are complete

----------------------------------------------------------------------------
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$ sed --version
GNU sed 版本 4.2.1
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.

GNU sed home page: <http://www.gnu.org/software/sed/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
E-mail bug reports to: <bug-gnu-utils@gnu.org>.
Be sure to include the word ``sed'' somewhere in the ``Subject:'' field.

$ sed          
用法: sed.exe [选项]... {脚本(如果没有其他脚本)} [输入文件]...

  -n, --quiet, --silent
                 取消自动打印模式空间
  -e 脚本, --expression=脚本
                 添加“脚本”到程序的运行列表
  -f 脚本文件, --file=脚本文件
                 添加“脚本文件”到程序的运行列表
  -i[扩展名], --in-place[=扩展名]
                 直接修改文件(如果指定扩展名就备份文件)
  -b, --binary
                 以二进制方式打开文件 (回车加换行不做特殊处理)
  -c, --copy
                 use copy instead of rename when shuffling files in -i mode
                 (avoids change of input file ownership)
  -l N, --line-length=N
                 指定“l”命令的换行期望长度
  --posix
                 关闭所有 GNU 扩展
  -r, --regexp-extended
                 在脚本中使用扩展正则表达式
  -s, --separate
                 将输入文件视为各个独立的文件而不是一个长的连续输入
  -u, --unbuffered
                 从输入文件读取最少的数据，更频繁的刷新输出
      --help     打印帮助并退出
      --version  输出版本信息并退出

如果没有 -e, --expression, -f 或 --file 选项，那么第一个非选项参数被视为
sed脚本。其他非选项参数被视为输入文件，如果没有输入文件，那么程序将从标准
输入读取数据。
GNU sed home page: <http://www.gnu.org/software/sed/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
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This is a port of GNU Sed 4.2.1 to MSDOS/DJGPP.

1.:     DJGPP specific changes.
        =======================

      - To compile the sources you will need libsupp 6.2 or later.  The library
        provides a fixed version of popen()/pclose() functions and some other
        functions from the libc cvs repository that will replace or extend the
        functionality of those ones that come with djdev204 (2004-11-25).
      - This version of the port will support the generation of 8+3 valid
        backup names for input file names if only SFN support is available.
        This concerns the '-i' option (in-place editing).
      - The port will open the input stream in binary mode.  This will allow to
        process files that contain embedded ^Z and lone ^M characters.
      - This version of the port no longer support the bootstrapping of sed.
      - You will need LFN support to configure and compile the source package.
        I have no plans to support SFN systems to build the sed binaries.

        As usual, all djgpp specific files (config.bat, diffs, readme files,
        etc.) are located in the djgpp subdir.


2.:     Installing the binary package.
        ==============================

2.1.:   Copy the binary distribution into the top DJGPP installation directory
        and unzip it running *ONE* of the following commands:
          unzip32 sed421b.zip      or
          djtarx sed421b.zip       or
          pkunzip -d sed421b.zip

2.2.:   If there is no entry for the sed info docs in your dir file, located
        info directory, create one running the command:
          install-info --info-dir=/dev/env/DJDIR/info /dev/env/DJDIR/info/sed.info

        For futher information about GNU Sed please read the info docs and the NEWS file.


3.:     Building the binaries from sources.
        ===================================

3.1.:   To build the binaries you will need the following binary packages:
          djdev203.zip (patch level 2, see the djdev203.dsm)
          bsh204br2.zip, gccNNNb.zip, bnuNNNb.zip, makNNNb.zip,
          filNNNb.zip, shlNNNb.zip, txtNNNb.zip, txiNNNb.zip,
          grepNNNb.zip, sedNNNb.zip and difNNNb.zip.
        NNN stands for the current version of that port.  All these packages can
        be found in the /v2gnu directory of ftp.delorie.com and any mirror.
        Previuos versions of those packages may do the job as well but I have
        not tested this.

3.2.:   Create a temporary directory. Copy the source package: sed421s.zip
        into the directory and unzip it runnig ONE of the following commands:
          unzip32 sed421s.zip      or
          djtarx sed421s.zip       or
          pkunzip -d sed421s.zip

3.3.:   If for some reason you want to reconfigure the package cd into the top
        srcdir (sed-4.2-1) and run the following commands:
          del djgpp\config.cache
          make distclean
          djgpp\config

        Please note that you *MUST* delete the config.cache file in the /djgpp
        subdir or you will not really reconfigure the sources because the
        configuration informations will be read from the cache file instead
        of being newly computed.
        To build the programs in a directory other than where the sources are,
        you must add the parameter that specifies the source directory,
        e.g:
          x:\src\gnu\sed-4.2-1\djgpp\config x:/src/gnu/sed-4.2-1
        or:
          x:\src\gnu\sed-4.2-1\djgpp\xp-config x:/src/gnu/sed-4.2-1

        Lets assume you want to build the binaries in a directory placed on a
        different drive (z:\build in this case) from where the sources are,
        then you will run the following commands:
          z:
          md \build
          cd \build
          x:\src\gnu\sed-4.2-1\djgpp\config x:/src/gnu/sed-4.2-1
        or:
          x:\src\gnu\sed-4.2-1\djgpp\xp-config x:/src/gnu/sed-4.2-1

        The order of the options and the srcdir option does not matter. You
        *MUST* use forward slashes to specify the source directory.

        The batch file will set same environment variables, make MSDOS specific
        modifications to the Makefile.ins and supply all other needed options
        to the configure script.


3.4.:   To compile the package run from the top srcdir the command:
          make

3.5.:   Now you can run the tests if you like. From the top srcdir run the
        command:
          make check

        No one of the tests should fail no matter if you have used stock djdev203
        or beta djdev204.

3.6.:   To install the binary, info docs and man pages run the following command
        from the top srcdir:
          make install

        This will install the products into your DJGPP installation tree given
        by the default prefix "/dev/env/DJDIR". If you prefer to install them
        into some other directory you will have to set prefix to the appropiate
        value.
        Example:
          make install prefix=z:/some/other/dir




        Send sed specific bug reports to <bonzini@gnu.org>.
        Send suggestions and bug reports concerning the DJGPP port
        to comp.os.msdos.djgpp or <djgpp@delorie.com>.

Enjoy.

          Guerrero, Juan Manuel <juan.guerrero@gmx.de>
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