sed编辑器基础

xiaoxiao2021-02-28  8

一、 更多的替换选项 ①替换标记 root@localhost sed]# cat data4.txt This is a test of the test script. This is the second test of the test script. [root@localhost sed]# sed 's/test/trial/' data4.txt This is a trial of the test script. This is the second trial of the test script. 替换格式:   s/pattern/replacement/flags 4种可用的替换标记: 数字:表明新闻本将替换第几处模式匹配的地方; g,表明新文本将会替换所有匹配的文本; p,表明原先行的内容要打印出来; w file,将替换的结果写到文件中。 可以指定sed编辑器用新文本替换第几处模式匹配的地方。 [root@localhost sed]# sed 's/test/trial/2' data4.txt This is a test of the trial script. This is the second test of the trial script. 后面第二个test被替换掉了。 用g替换标记,能替换全部 [root@localhost sed]# sed 's/test/trial/g' data4.txt This is a trial of the trial script. This is the second trial of the trial script. p替换标记会只打印修改过的行,和-n选项(禁止输出)一起使用。 [root@localhost sed]# cat data5.txt This is a test line. This is a different line. [root@localhost sed]# sed -n 's/test/trial/p' data5.txt This is a trial line. ②替换字符 替换(/),可以用其他字符替换字符串分隔符 [root@localhost sed]# sed -n 's!/bin/bash!/bin/csh!p' /etc/passwd root:x:0:0:root:/root:/bin/csh tq2440:x:500:500:tq2440:/home/tq2440:/bin/csh win:x:501:501::/home/win:/bin/csh 二、使用地址 sed有两种形式的行寻址: ①以数字形式表示行区间 ②用文本模式来过滤出行 [address] command 1.数字方式的行寻址 [root@localhost sed]# sed '2s/dog/cat/' data1.txt The quick brown fox jumps over the lazy dog. The quick brown fox jumps over the lazy cat. The quick brown fox jumps over the lazy dog. <script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script> 阅读(37) | 评论(0) | 转发(0) | 0

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