sed用得少？sed常用语法简介
一、sed简介
sed简称流编辑器，即stream editor的缩写。sed是一个操作、过滤和转换文本内容的强大工具。常用的功能有通过结合正则表达式对文件实现快速的增删改查。最常用的查询功能是过滤（过滤指定字符串）、取行（取出指定行）。
二、sed语法
（一）sed常用语法如下：
sed [选项参数] '[定位符]sed内置命令字符' 文件
或
sed [选项参数] [定位符]sed内置命令字符 文件
或通过执行命令以管道符输送给sed命令处理
命令 | sed [选项参数] '[定位符]sed内置命令字符' 文件1、sed常用选项参数有：-n：表示取消默认的sed输出，通常与sed内置命令p一起使用；-i：表示直接将修改结果写入文件，如果不加-i，sed修改的是内存数据；-e：表示多次编辑，不需要管道符号；-r：表示支持正则表达式；2、sed内置的命令字符，主要是用于对文件进行增删改查等操作，常见内置命令字符有：a：表示对文本进行追加操作，在指定行后面添加一行或多行文本；d：表示删除匹配行；c:替换行；i：表示插入文本，在指定行前添加一行或多行文本；p：表示打印匹配行内容，通常与-n一同使用；s/正则/替换内容/g：表示匹配正则内容，然后替换内容（支持正则表达式），结尾g表示全局匹配；=:打印行号;r:表示读取文件或者导入文件内容；w:表示文件另存为或者导出文件内容;3、sed匹配范围主要有：空地址：表示全文处理；单地址：表示指定文件某一行；/pattern/:表示被模式匹配到的每一行；范围区间：如12,22表示十二行到二十二行，如12,+5表示第12行向下5行；步长：如1~2，表示1,3,5,7,9行；2~2，表示2,4,6，8,10行；
三、sed实例合集
以下例子针对sed语法进行举例，并且都是实际工作中常用到的剑客招式。
（一）通过定位符打印文件中指定的行：
首先准备一份文件sed_test.txt进行例子演示，该文件内容如下所示：
we are from haodaolinuxxiaoming is a good boy !xiaohong is a girl .we all like study .i like linuxwe stuty pythonyou study networkthey study linuxliming like javajam like mysqltom like redis例子1、通过sed命令打印sed_test.txt文件第4行的内容，命令执行如下：[root@haodaolinux1 home]# sed -n '4p' sed_test.txt we all like study .
例子2、通过sed命令打印sed_test.txt文件第1行到第4行的内容，命令执行如下：
[root@haodaolinux1 home]# sed -n '1,4p' sed_test.txt we are from haodaolinuxxiaoming is a good boy !xiaohong is a girl .we all like study .例子3、通过sed命令打印sed_test.txt文件第2行以及后面的4行的内容，命令执行如下：[root@haodaolinux1 home]# sed -n '2,+4p' sed_test.txt xiaoming is a good boy !xiaohong is a girl .we all like study .i like linuxwe stuty python例子4、通过sed命令打印sed_test.txt文件第1行开始，步长为2的所有内容，命令执行如下：[root@haodaolinux1 home]# sed -n '1~2p' sed_test.txt we are from haodaolinuxxiaohong is a girl .i like linuxyou study networkliming like javatom like redis例子5、通过sed命令打印sed_test.txt文件以we开头的所有行，命令执行如下：[root@haodaolinux1 home]# sed -rn '/^we/p' sed_test.txt we are from haodaolinuxwe all like study .we stuty python例子6、通过sed命令打印sed_test.txt文件中有like的所有行，命令执行如下：[root@haodaolinux1 home]# sed -rn '/like/p' sed_test.txt we all like study .i like linuxliming like javajam like mysqltom like redis例子7、通过sed命令打印sed_test.txt文件第1行，第3行，第5行的所有行，命令执行如下：[root@haodaolinux1 home]# sed -n '1p;3p;5p' sed_test.txt we are from haodaolinuxxiaohong is a girl .i like linux例子8、通过sed命令打印sed_test.txt文件第3行以外的所有行，命令执行如下：[root@haodaolinux1 home]# sed -n '3!p' sed_test.txt we are from haodaolinuxxiaoming is a good boy !we all like study .i like linuxwe stuty pythonyou study networkthey study linuxliming like javajam like mysqltom like redis
例子9、通过sed命令过滤内存信息，命令执行如下所示：
[root@haodaolinux1 home]# free -m | sed -n '/mem/p'mem: 981 479 132 7 370 342例子10、通过sed命令过滤磁盘根分区的信息，命令执行如下所示：[root@haodaolinux1 home]# df -h | sed -n '//$/p'/dev/sda2 38g 28g 9.9g 74% /
（二）删除指定文件中相关内容：
如果要对源文件进行删除操作，需要加上-i选项！！！
首先准备一份文件sed_test01.txt进行例子演示，该文件内容如下所示：
we are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子1、通过sed命令删除sed_test01.txt文件第3行的内容，命令执行如下：[root@haodaolinux1 home]# sed '3d' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子2、通过sed命令删除sed_test01.txt文件中以#开头的行，命令执行如下：[root@haodaolinux1 home]# sed '/^#/d' sed_test01.txtwe are from haodaolinux and we are study linux .xiaoming is a good boy !we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis例子3、通过sed命令删除sed_test01.txt文件中不包含like的行，命令执行如下：[root@haodaolinux1 home]# sed '/like/!d' sed_test01.txt #you do not like study ?we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .liming like javajam like mysqltom like redis例子4、通过sed命令删除sed_test01.txt文件中空白的行，命令执行如下：[root@haodaolinux1 home]# sed '/^$/d' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子5、通过sed命令将sed_test01.txt文件中所有行替换为haodaolinux，命令执行如下：[root@haodaolinux1 home]# sed 'c haodaolinux' sed_test01.txthaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinux例子6、通过sed命令将sed_test01.txt文件中第3行替换为haodaolinux，命令执行如下：[root@haodaolinux1 home]# sed '3c haodaolinux' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?haodaolinuxwe all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子7、通过sed命令将sed_test01.txt文件中boy所在的行替换为boy=student，命令执行如下：[root@haodaolinux1 home]# sed '/boy/c boy=student' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?boy=studentwe all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子8、通过sed命令将sed_test01.txt文件中每一行的第1个we替换为they，命令执行如下：[root@haodaolinux1 home]# sed 's/we/they/' sed_test01.txt they are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !they all like study and we are the same and we are together !i like linuxthey stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so they will get the python book.例子9、通过sed命令将sed_test01.txt文件中每一行的所有we替换为they，命令执行如下：[root@haodaolinux1 home]# sed 's/we/they/g' sed_test01.txtthey are from haodaolinux and they are study linux .#you do not like study ?xiaoming is a good boy !they all like study and they are the same and they are together !i like linuxthey stuty python , they like java , they like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so they will get the python book.例子10、通过sed命令将sed_test01.txt文件中每一行的第3个we替换为they，命令执行如下：[root@haodaolinux1 home]# sed 's/we/they/3' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !we all like study and we are the same and they are together !i like linuxwe stuty python , we like java , they like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子11、通过sed命令将sed_test01.txt文件中每一行的所有we替换为(we)，命令执行如下：[root@haodaolinux1 home]# sed 's/we/(&)/g' sed_test01.txt (we) are from haodaolinux and (we) are study linux .#you do not like study ?xiaoming is a good boy !(we) all like study and (we) are the same and (we) are together !i like linux(we) stuty python , (we) like java , (we) like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so (we) will get the python book.例子12、通过sed命令将sed_test01.txt文件中第4行的所有we替换为they，命令执行如下：[root@haodaolinux1 home]# sed '4s/we/they/g' sed_test01.txt we are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !they all like study and they are the same and they are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子13、通过sed命令将sed_test01.txt文件中第4行的所有we进行删除，命令执行如下：[root@haodaolinux1 home]# sed '4s/we//g' sed_test01.txt we are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy ! all like study and are the same and are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子14、通过sed命令将sed_test01.txt文件中第4行的第1个we替换为they，并且只将该行打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '4s/we/they/p' sed_test01.txt they all like study and we are the same and we are together !例子15、通过sed命令将sed_test01.txt文件中第4行的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '4=' sed_test01.txt 4例子15、通过sed命令将sed_test01.txt文件中包含like的行的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '/like/=' sed_test01.txt 2467101112例子16、通过sed命令将sed_test01.txt文件中将以java结尾的行的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '/java$/=' sed_test01.txt 10例子17、通过sed命令将sed_test01.txt文件中总的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '$=' sed_test01.txt 13
（三）通过sed对文件中的多行文本进行处理：
如果要对源文件进行编辑操作，需要加上-i选项！！！
首先准备一份文件sed_test02.txt进行例子演示，该文件内容如下所示：
linux python network linuxpython linux c mysqljava html php gogo mysql python pythonphp c++ python php例子1、通过sed命令在sed_test02.txt文件中的第2行前插入we are study，命令执行如下：[root@haodaolinux1 home]# sed '2i we are study' sed_test02.txt linux python network linuxwe are studypython linux c mysqljava html php gogo mysql python pythonphp c++ python php例子2、通过sed命令在sed_test02.txt文件中有mysql的行前插入you are study，命令执行如下：[root@haodaolinux1 home]# sed '/mysql/i you are study' sed_test02.txt linux python network linuxyou are studypython linux c mysqljava html php goyou are studygo mysql python pythonphp c++ python php例子3、通过sed命令在sed_test02.txt文件中的第2行h后追加we are study too，命令执行如下：[root@haodaolinux1 home]# sed '2a we are study too' sed_test02.txt linux python network linuxpython linux c mysqlwe are study toojava html php gogo mysql python pythonphp c++ python php例子4、通过sed命令在sed_test02.txt文件中有mysql的行后追加you are study too，命令执行如下：[root@haodaolinux1 home]# sed '/mysql/a you are study too' sed_test02.txt linux python network linuxpython linux c mysqlyou are study toojava html php gogo mysql python pythonyou are study toophp c++ python php例子5、两个文件内容合并实例： 首先创建read.txt文件内容如下所示：we are studyyou are studythey are study（1）通过sed命令读取read.txt文件的内容，将读取内容追加到sed_test02.txt文件中每一行的后面，命令执行如下：[root@haodaolinux1 home]# sed 'r read.txt' sed_test02.txt linux python network linuxwe are studyyou are studythey are studypython linux c mysqlwe are studyyou are studythey are studyjava html php gowe are studyyou are studythey are studygo mysql python pythonwe are studyyou are studythey are studyphp c++ python phpwe are studyyou are studythey are study（2）通过sed命令读取read.txt文件的内容，将读取内容追加到sed_test02.txt文件中的第3行的后面，命令执行如下：[root@haodaolinux1 home]# sed '3r read.txt' sed_test02.txt linux python network linuxpython linux c mysqljava html php gowe are studyyou are studythey are studygo mysql python pythonphp c++ python php（3）通过sed命令读取read.txt文件的内容，将读取内容追加到sed_test02.txt文件中有mysql行的后面，命令执行如下：[root@haodaolinux1 home]# sed '/mysql/r read.txt' sed_test02.txt linux python network linuxpython linux c mysqlwe are studyyou are studythey are studyjava html php gogo mysql python pythonwe are studyyou are studythey are studyphp c++ python php例子6：文件内容另存为其它文件实例：
（1）通过sed命令读取sed_test02.txt文件中所有内容，另存为write.txt文件，命令执行如下：
[root@haodaolinux1 home]# sed 'w write.txt' sed_test02.txt linux python network linuxpython linux c mysqljava html php gogo mysql python pythonphp c++ python php（2）通过sed命令将sed_test02.txt文件中包含mysql的行，另存为write_mysql.txt文件，命令执行如下：[root@haodaolinux1 home]# sed -i '/mysql/w write_mysql.txt' sed_test02.txt（3）通过sed命令将sed_test02.txt文件中1行到3行的内容，另存为write_13.txt文件，命令执行如下：[root@haodaolinux1 home]# sed -i '2,3w write_13.txt' sed_test02.txt
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sed简称流编辑器，即stream editor的缩写。sed是一个操作、过滤和转换文本内容的强大工具。常用的功能有通过结合正则表达式对文件实现快速的增删改查。最常用的查询功能是过滤（过滤指定字符串）、取行（取出指定行）。
二、sed语法
（一）sed常用语法如下：
sed [选项参数] '[定位符]sed内置命令字符' 文件
或
sed [选项参数] [定位符]sed内置命令字符 文件
或通过执行命令以管道符输送给sed命令处理
命令 | sed [选项参数] '[定位符]sed内置命令字符' 文件1、sed常用选项参数有：-n：表示取消默认的sed输出，通常与sed内置命令p一起使用；-i：表示直接将修改结果写入文件，如果不加-i，sed修改的是内存数据；-e：表示多次编辑，不需要管道符号；-r：表示支持正则表达式；2、sed内置的命令字符，主要是用于对文件进行增删改查等操作，常见内置命令字符有：a：表示对文本进行追加操作，在指定行后面添加一行或多行文本；d：表示删除匹配行；c:替换行；i：表示插入文本，在指定行前添加一行或多行文本；p：表示打印匹配行内容，通常与-n一同使用；s/正则/替换内容/g：表示匹配正则内容，然后替换内容（支持正则表达式），结尾g表示全局匹配；=:打印行号;r:表示读取文件或者导入文件内容；w:表示文件另存为或者导出文件内容;3、sed匹配范围主要有：空地址：表示全文处理；单地址：表示指定文件某一行；/pattern/:表示被模式匹配到的每一行；范围区间：如12,22表示十二行到二十二行，如12,+5表示第12行向下5行；步长：如1~2，表示1,3,5,7,9行；2~2，表示2,4,6，8,10行；
三、sed实例合集
以下例子针对sed语法进行举例，并且都是实际工作中常用到的剑客招式。
（一）通过定位符打印文件中指定的行：
首先准备一份文件sed_test.txt进行例子演示，该文件内容如下所示：
we are from haodaolinuxxiaoming is a good boy !xiaohong is a girl .we all like study .i like linuxwe stuty pythonyou study networkthey study linuxliming like javajam like mysqltom like redis例子1、通过sed命令打印sed_test.txt文件第4行的内容，命令执行如下：[root@haodaolinux1 home]# sed -n '4p' sed_test.txt we all like study .
例子2、通过sed命令打印sed_test.txt文件第1行到第4行的内容，命令执行如下：
[root@haodaolinux1 home]# sed -n '1,4p' sed_test.txt we are from haodaolinuxxiaoming is a good boy !xiaohong is a girl .we all like study .例子3、通过sed命令打印sed_test.txt文件第2行以及后面的4行的内容，命令执行如下：[root@haodaolinux1 home]# sed -n '2,+4p' sed_test.txt xiaoming is a good boy !xiaohong is a girl .we all like study .i like linuxwe stuty python例子4、通过sed命令打印sed_test.txt文件第1行开始，步长为2的所有内容，命令执行如下：[root@haodaolinux1 home]# sed -n '1~2p' sed_test.txt we are from haodaolinuxxiaohong is a girl .i like linuxyou study networkliming like javatom like redis例子5、通过sed命令打印sed_test.txt文件以we开头的所有行，命令执行如下：[root@haodaolinux1 home]# sed -rn '/^we/p' sed_test.txt we are from haodaolinuxwe all like study .we stuty python例子6、通过sed命令打印sed_test.txt文件中有like的所有行，命令执行如下：[root@haodaolinux1 home]# sed -rn '/like/p' sed_test.txt we all like study .i like linuxliming like javajam like mysqltom like redis例子7、通过sed命令打印sed_test.txt文件第1行，第3行，第5行的所有行，命令执行如下：[root@haodaolinux1 home]# sed -n '1p;3p;5p' sed_test.txt we are from haodaolinuxxiaohong is a girl .i like linux例子8、通过sed命令打印sed_test.txt文件第3行以外的所有行，命令执行如下：[root@haodaolinux1 home]# sed -n '3!p' sed_test.txt we are from haodaolinuxxiaoming is a good boy !we all like study .i like linuxwe stuty pythonyou study networkthey study linuxliming like javajam like mysqltom like redis
例子9、通过sed命令过滤内存信息，命令执行如下所示：
[root@haodaolinux1 home]# free -m | sed -n '/mem/p'mem: 981 479 132 7 370 342例子10、通过sed命令过滤磁盘根分区的信息，命令执行如下所示：[root@haodaolinux1 home]# df -h | sed -n '//$/p'/dev/sda2 38g 28g 9.9g 74% /
（二）删除指定文件中相关内容：
如果要对源文件进行删除操作，需要加上-i选项！！！
首先准备一份文件sed_test01.txt进行例子演示，该文件内容如下所示：
we are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子1、通过sed命令删除sed_test01.txt文件第3行的内容，命令执行如下：[root@haodaolinux1 home]# sed '3d' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子2、通过sed命令删除sed_test01.txt文件中以#开头的行，命令执行如下：[root@haodaolinux1 home]# sed '/^#/d' sed_test01.txtwe are from haodaolinux and we are study linux .xiaoming is a good boy !we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis例子3、通过sed命令删除sed_test01.txt文件中不包含like的行，命令执行如下：[root@haodaolinux1 home]# sed '/like/!d' sed_test01.txt #you do not like study ?we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .liming like javajam like mysqltom like redis例子4、通过sed命令删除sed_test01.txt文件中空白的行，命令执行如下：[root@haodaolinux1 home]# sed '/^$/d' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !we all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子5、通过sed命令将sed_test01.txt文件中所有行替换为haodaolinux，命令执行如下：[root@haodaolinux1 home]# sed 'c haodaolinux' sed_test01.txthaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinuxhaodaolinux例子6、通过sed命令将sed_test01.txt文件中第3行替换为haodaolinux，命令执行如下：[root@haodaolinux1 home]# sed '3c haodaolinux' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?haodaolinuxwe all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子7、通过sed命令将sed_test01.txt文件中boy所在的行替换为boy=student，命令执行如下：[root@haodaolinux1 home]# sed '/boy/c boy=student' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?boy=studentwe all like study and we are the same and we are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子8、通过sed命令将sed_test01.txt文件中每一行的第1个we替换为they，命令执行如下：[root@haodaolinux1 home]# sed 's/we/they/' sed_test01.txt they are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !they all like study and we are the same and we are together !i like linuxthey stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so they will get the python book.例子9、通过sed命令将sed_test01.txt文件中每一行的所有we替换为they，命令执行如下：[root@haodaolinux1 home]# sed 's/we/they/g' sed_test01.txtthey are from haodaolinux and they are study linux .#you do not like study ?xiaoming is a good boy !they all like study and they are the same and they are together !i like linuxthey stuty python , they like java , they like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so they will get the python book.例子10、通过sed命令将sed_test01.txt文件中每一行的第3个we替换为they，命令执行如下：[root@haodaolinux1 home]# sed 's/we/they/3' sed_test01.txtwe are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !we all like study and we are the same and they are together !i like linuxwe stuty python , we like java , they like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子11、通过sed命令将sed_test01.txt文件中每一行的所有we替换为(we)，命令执行如下：[root@haodaolinux1 home]# sed 's/we/(&)/g' sed_test01.txt (we) are from haodaolinux and (we) are study linux .#you do not like study ?xiaoming is a good boy !(we) all like study and (we) are the same and (we) are together !i like linux(we) stuty python , (we) like java , (we) like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so (we) will get the python book.例子12、通过sed命令将sed_test01.txt文件中第4行的所有we替换为they，命令执行如下：[root@haodaolinux1 home]# sed '4s/we/they/g' sed_test01.txt we are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy !they all like study and they are the same and they are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子13、通过sed命令将sed_test01.txt文件中第4行的所有we进行删除，命令执行如下：[root@haodaolinux1 home]# sed '4s/we//g' sed_test01.txt we are from haodaolinux and we are study linux .#you do not like study ?xiaoming is a good boy ! all like study and are the same and are together !i like linuxwe stuty python , we like java , we like linux .you study networkthey study linuxliming like javajam like mysqltom like redis#so we will get the python book.例子14、通过sed命令将sed_test01.txt文件中第4行的第1个we替换为they，并且只将该行打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '4s/we/they/p' sed_test01.txt they all like study and we are the same and we are together !例子15、通过sed命令将sed_test01.txt文件中第4行的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '4=' sed_test01.txt 4例子15、通过sed命令将sed_test01.txt文件中包含like的行的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '/like/=' sed_test01.txt 2467101112例子16、通过sed命令将sed_test01.txt文件中将以java结尾的行的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '/java$/=' sed_test01.txt 10例子17、通过sed命令将sed_test01.txt文件中总的行号打印输出，命令执行如下：[root@haodaolinux1 home]# sed -n '$=' sed_test01.txt 13
（三）通过sed对文件中的多行文本进行处理：
如果要对源文件进行编辑操作，需要加上-i选项！！！
首先准备一份文件sed_test02.txt进行例子演示，该文件内容如下所示：
linux python network linuxpython linux c mysqljava html php gogo mysql python pythonphp c++ python php例子1、通过sed命令在sed_test02.txt文件中的第2行前插入we are study，命令执行如下：[root@haodaolinux1 home]# sed '2i we are study' sed_test02.txt linux python network linuxwe are studypython linux c mysqljava html php gogo mysql python pythonphp c++ python php例子2、通过sed命令在sed_test02.txt文件中有mysql的行前插入you are study，命令执行如下：[root@haodaolinux1 home]# sed '/mysql/i you are study' sed_test02.txt linux python network linuxyou are studypython linux c mysqljava html php goyou are studygo mysql python pythonphp c++ python php例子3、通过sed命令在sed_test02.txt文件中的第2行h后追加we are study too，命令执行如下：[root@haodaolinux1 home]# sed '2a we are study too' sed_test02.txt linux python network linuxpython linux c mysqlwe are study toojava html php gogo mysql python pythonphp c++ python php例子4、通过sed命令在sed_test02.txt文件中有mysql的行后追加you are study too，命令执行如下：[root@haodaolinux1 home]# sed '/mysql/a you are study too' sed_test02.txt linux python network linuxpython linux c mysqlyou are study toojava html php gogo mysql python pythonyou are study toophp c++ python php例子5、两个文件内容合并实例： 首先创建read.txt文件内容如下所示：we are studyyou are studythey are study（1）通过sed命令读取read.txt文件的内容，将读取内容追加到sed_test02.txt文件中每一行的后面，命令执行如下：[root@haodaolinux1 home]# sed 'r read.txt' sed_test02.txt linux python network linuxwe are studyyou are studythey are studypython linux c mysqlwe are studyyou are studythey are studyjava html php gowe are studyyou are studythey are studygo mysql python pythonwe are studyyou are studythey are studyphp c++ python phpwe are studyyou are studythey are study（2）通过sed命令读取read.txt文件的内容，将读取内容追加到sed_test02.txt文件中的第3行的后面，命令执行如下：[root@haodaolinux1 home]# sed '3r read.txt' sed_test02.txt linux python network linuxpython linux c mysqljava html php gowe are studyyou are studythey are studygo mysql python pythonphp c++ python php（3）通过sed命令读取read.txt文件的内容，将读取内容追加到sed_test02.txt文件中有mysql行的后面，命令执行如下：[root@haodaolinux1 home]# sed '/mysql/r read.txt' sed_test02.txt linux python network linuxpython linux c mysqlwe are studyyou are studythey are studyjava html php gogo mysql python pythonwe are studyyou are studythey are studyphp c++ python php例子6：文件内容另存为其它文件实例：
（1）通过sed命令读取sed_test02.txt文件中所有内容，另存为write.txt文件，命令执行如下：
[root@haodaolinux1 home]# sed 'w write.txt' sed_test02.txt linux python network linuxpython linux c mysqljava html php gogo mysql python pythonphp c++ python php（2）通过sed命令将sed_test02.txt文件中包含mysql的行，另存为write_mysql.txt文件，命令执行如下：[root@haodaolinux1 home]# sed -i '/mysql/w write_mysql.txt' sed_test02.txt（3）通过sed命令将sed_test02.txt文件中1行到3行的内容，另存为write_13.txt文件，命令执行如下：[root@haodaolinux1 home]# sed -i '2,3w write_13.txt' sed_test02.txt
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