Copyright © 2004，2005, 本文遵从GNU 的自由文档许可证(Free Document License)的条款，欢迎转载、修改、散布。
最近更新:2005年12月22日，增加小技巧章节。
sed 是一种在线编辑器，它一次处理一行内容。处理时，把当前处理的行存储在临时缓冲区中，称为“模式空间”（pattern space），接着用sed命令处理缓冲区中的内容，处理完成后，把缓冲区的内容送往屏幕。接着处理下一行，这样不断重复，直到文件末尾。文件内容并没有 改变，除非你使用重定向存储输出。Sed主要用来自动编辑一个或多个文件；简化对文件的反复操作；编写转换程序等。以下介绍的是Gnu版本的Sed 3.02。
可以通过定址来定位你所希望编辑的行，该地址用数字构成，用逗号分隔的两个行数表示以这两行为起止的行的范围（包括行数表示的那两行）。如1，3表示1，2，3行，美元符号($)表示最后一行。范围可以通过数据，正则表达式或者二者结合的方式确定 。
调用sed命令有两种形式：
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a\
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在当前行后面加入一行文本。
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b lable
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分支到脚本中带有标记的地方，如果分支不存在则分支到脚本的末尾。
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c\
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用新的文本改变本行的文本。
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d
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从模板块（Pattern space）位置删除行。
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D
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删除模板块的第一行。
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i\
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在当前行上面插入文本。
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h
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拷贝模板块的内容到内存中的缓冲区。
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H
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追加模板块的内容到内存中的缓冲区
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g
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获得内存缓冲区的内容，并替代当前模板块中的文本。
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G
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获得内存缓冲区的内容，并追加到当前模板块文本的后面。
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l
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列表不能打印字符的清单。
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n
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读取下一个输入行，用下一个命令处理新的行而不是用第一个命令。
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N
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追加下一个输入行到模板块后面并在二者间嵌入一个新行，改变当前行号码。
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p
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打印模板块的行。
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P（大写）
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打印模板块的第一行。
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q
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退出Sed。
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r file
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从file中读行。
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t label
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if分支，从最后一行开始，条件一旦满足或者T，t命令，将导致分支到带有标号的命令处，或者到脚本的末尾。
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T label
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错误分支，从最后一行开始，一旦发生错误或者T，t命令，将导致分支到带有标号的命令处，或者到脚本的末尾。
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w file
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写并追加模板块到file末尾。
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W file
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写并追加模板块的第一行到file末尾。
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!
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表示后面的命令对所有没有被选定的行发生作用。
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s/re/string
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用string替换正则表达式re。
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=
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打印当前行号码。
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#
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把注释扩展到下一个换行符以前。
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以下的是替换标记
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-e command, --expression=command
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允许多台编辑。
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-h, --help
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打印帮助，并显示bug列表的地址。
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-n, --quiet, --silent
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取消默认输出。
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-f, --filer=script-file
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引导sed脚本文件名。
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-V, --version
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打印版本和版权信息。
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^
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锚定行的开始 如：/^sed/匹配所有以sed开头的行。
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$
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锚定行的结束 如：/sed$/匹配所有以sed结尾的行。
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.
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匹配一个非换行符的字符 如：/s.d/匹配s后接一个任意字符，然后是d。
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*
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匹配零或多个字符 如：/*sed/匹配所有模板是一个或多个空格后紧跟sed的行。
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[]
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匹配一个指定范围内的字符，如/[Ss]ed/匹配sed和Sed。
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[^]
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匹配一个不在指定范围内的字符，如：/[^A-RT-Z]ed/匹配不包含A-R和T-Z的一个字母开头，紧跟ed的行。
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\(..\)
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保存匹配的字符，如s/\(love\)able/\1rs，loveable被替换成lovers。
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&
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保存搜索字符用来替换其他字符，如s/love/**&**/，love这成**love**。
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\<
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锚定单词的开始，如:/\<love/匹配包含以love开头的单词的行。
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\>
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锚定单词的结束，如/love\>/匹配包含以love结尾的单词的行。
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x\{m\}
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重复字符x，m次，如：/0\{5\}/匹配包含5个o的行。
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x\{m,\}
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重复字符x,至少m次，如：/o\{5,\}/匹配至少有5个o的行。
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x\{m,n\}
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重复字符x，至少m次，不多于n次，如：/o\{5,10\}/匹配5--10个o的行。
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删除：d命令
-
-
$ sed '2d' example-----删除example文件的第二行。
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$ sed '2,$d' example-----删除example文件的第二行到末尾所有行。
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$ sed '$d' example-----删除example文件的最后一行。
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$ sed '/test/'d example-----删除example文件所有包含test的行。
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替换：s命令
-
-
$ sed 's/test/mytest/g' example-----在整行范围内把test替换为mytest。如果没有g标记，则只有每行第一个匹配的test被替换成mytest。
-
$ sed -n 's/^test/mytest/p' example-----(-n)选项和p标志一起使用表示只打印那些发生替换的行。也就是说，如果某一行开头的test被替换成mytest，就打印它。
-
$ sed 's/^192.168.0.1/&localhost/' example-----&符号表示替换换字符串中被找到的部份。所有以192.168.0.1开头的行都会被替换成它自已加 localhost，变成192.168.0.1localhost。
-
$ sed -n 's/\(love\)able/\1rs/p' example-----love被标记为1，所有loveable会被替换成lovers，而且替换的行会被打印出来。
-
$ sed 's#10#100#g' example-----不论什么字符，紧跟着s命令的都被认为是新的分隔符，所以，“#”在这里是分隔符，代替了默认的“/”分隔符。表示把所有10替换成100。
-
选定行的范围：逗号
-
-
$ sed -n '/test/,/check/p' example-----所有在模板test和check所确定的范围内的行都被打印。
-
$ sed -n '5,/^test/p' example-----打印从第五行开始到第一个包含以test开始的行之间的所有行。
-
$ sed '/test/,/check/s/$/sed test/' example-----对于模板test和west之间的行，每行的末尾用字符串sed test替换。
-
多点编辑：e命令
-
-
$ sed -e '1,5d' -e 's/test/check/' example-----(-e)选项允许在同一行里执行多条命令。如例子所示，第一条命令删除1至5行，第二条命令用check替换test。命令的执 行顺序对结果有影响。如果两个命令都是替换命令，那么第一个替换命令将影响第二个替换命令的结果。
-
$ sed --expression='s/test/check/' --expression='/love/d' example-----一个比-e更好的命令是--expression。它能给sed表达式赋值。
-
从文件读入：r命令
-
-
写入文件：w命令
-
-
追加命令：a命令
-
-
插入：i命令
-
$ sed '/test/i\\
new line
-------------------------' example
如果test被匹配，则把反斜杠后面的文本插入到匹配行的前面。
-
下一个：n命令
-
-
变形：y命令
-
-
退出：q命令
-
-
保持和获取：h命令和G命令
-
-
保持和互换：h命令和x命令
-
Sed脚本是一个sed的命令清单，启动Sed时以-f选项引导脚本文件名。Sed对于脚本中输入的命令非常挑剔，在命令的末尾不能有任何空白或文本，如果在一行中有多个命令，要用分号分隔。以#开头的行为注释行，且不能跨行。
-
在sed的命令行中引用shell变量时要使用双引号，而不是通常所用的单引号。下面是一个根据name变量的内容来删除named.conf文件中zone段的脚本：
name='zone\ "localhost"'
sed "/$name/,/};/d" named.conf
" named.conf
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