mirror of https://github.com/fengyuhetao/shell.git
105 lines
2.0 KiB
Bash
105 lines
2.0 KiB
Bash
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#!/bin/bash
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#sed编辑器基础
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#替换标记
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sed 's/lazy/ht/' ./test
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echo -e "next\n"
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#可用的替换标记
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#1.数字 表明新闻本将替换第几处模式匹配的地方
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sed 's/lazy/ht/2' ./test
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#2.g 表明新文件将会替换所有已有文本出现的地方
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sed 's/lazy/ht/g' ./test
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#3.p 表明原来行的内容要打印出来,替换后的
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sed 's/lazy/ht/p' ./test
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#4.w file 将替换的结果写到文件中
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sed 's/lazy/ht/w test1' ./test
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echo -e "next\n"
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#替换字符
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sed 's/\/bin\/bash/\/bin\/csh/' /etc/passwd
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#或者
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sed 's!/bin/bash!/bin/csh!' /etc/passwd
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echo -e "next\n"
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#使用地址
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#1.数字方式的行寻址
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sed '2s/lazy/cat/' ./test
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sed '2,3s/lazy/cat/' ./test
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sed '2,$s/lazy/cat/' ./test
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#2.使用文本模式过滤器
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sed '/tiandi/s/bash/csh/' /etc/passwd
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echo -e "next\n"
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#组合命令
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sed '2{
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s/fox/elephant/
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s/dog/cat/
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}' test
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sed '2,${
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s/fox/elephant/
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s/dog/cat/
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}' test
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echo -e "next\n"
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#删除行
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sed '3d' ./test
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sed '2,$d' ./test
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sed '/number 1/d' ./test
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#删除两个文本模式来删除某个范围的行，第一个开启删除功能，第二个关闭删除功能
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sed '/1/,/3/d' ./test
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echo -e "next\n"
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#插入和附加文本
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sed '3i\
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This is an appended line.' ./test
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sed '$a\
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This is a new line of text.' ./test
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#修改行
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sed '3c\
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This a changed line of text.' ./test
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sed '/number 1/c\
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This a changed line of text.' ./test
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#替换两行文本
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#sed '2,3c\
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#This a changed line of text.' ./test
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#转换命令，处理单个字符
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#sed 'y/123/789/' ./test
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echo -e "next\n"
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#回顾打印
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# p 打印文本行
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# -n 禁止其他行，只打印包含匹配文本模式的行
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sed -n '/number 3/p' ./test
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#查看修改之前的行和修改之后的行
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#sed -n '/3/{
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#p
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#s/line/test/p
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#}' ./test
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echo -e "next\n"
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# 打印行号
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sed '=' ./test
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#打印指定的行和行号
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#sed -n '/lazy/{
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#=
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#p
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#}' ./test
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#列出行 打印数据流中的文本和不可打印的ASCII字符，任何不可打印的字符都用它们的八进制值前加一个反斜线或标准C风格的命名法，比如用\t来代表制表符
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sed -n 'l' ./test
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