标签：脚本 编辑器 一个 技术分享 ade 移动 one 大写 display
下面这些命令未必经常会用到，但当需要时，知道这些肯定是件好事。
sed命令通常是对一行数据进行处理，然后下一行重复处理。
sed编辑器包含了三个可用来处理多行文本的特殊命令
两种删除匹配的下一行的办法：
cat data1.txt This is the header line. This is a data line. This is the last line. sed ‘/^$/d‘ data1.txt This is the header line. This is a data line. This is the last line. sed ‘/header/{n ; d}‘ data1.txt This is the header line. This is a data line. This is the last line.
用大写N，可以一次性读取两行。区别与n是移动到下一行。
$ sed ‘/first/{ N ; s/\n/ / }‘ data2.txt This is the header line. This is the first data line. This is the second data line. This is the last line. $ cat data2.txt This is the header line. This is the first data line. This is the second data line. This is the last line. $ cat data3.txt On Tuesday, the Linux System Administrator‘s group meeting will be held. All System Administrators should attend. Thank you for your attendance. $ sed ‘N ; s/System.Administrator/Desktop User/‘ data3.txt On Tuesday, the Linux Desktop User‘s group meeting will be held. All Desktop Users should attend. Thank you for your attendance.
在N后面最好匹配多行命令，而单行命令则可以放在N前面，如：
$ sed ‘N > s/System\nAdministrator/Desktop\nUser/ > s/System Administrator/Desktop User/ > ‘ data4.txt On Tuesday, the Linux Desktop User‘s group meeting will be held. All System Administrators should attend. $ cat data4.txt On Tuesday, the Linux System Administrator‘s group meeting will be held. All System Administrators should attend. $ sed ‘ > s/System Administrator/Desktop User/ > N > s/System\nAdministrator/Desktop\nUser/ > ‘ data4.txt On Tuesday, the Linux Desktop User‘s group meeting will be held. All Desktop Users should attend.
二、保持空间
三、排除命令
四、改变流
五、模式替代
六、在脚本中使用sed
七、创建sed实用工具
标签：脚本 编辑器 一个 技术分享 ade 移动 one 大写 display
原文地址：https://www.cnblogs.com/ch122633/p/10311935.html
