78 lines
1.6 KiB
Markdown
78 lines
1.6 KiB
Markdown
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### 语法
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- sed 选项 's/搜索的内容/替换的内容/动作' 需要处理的文件
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- 动作
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- p 打印
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- g 全局替换
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```
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me@me-EQ59:~/shell_demo$ cat file1
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lfla
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fla
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flavnanv
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rpprp
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dbdfblbjaljl;ka
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me@me-EQ59:~/shell_demo$ sed -n 's/fla/FLA/p' file1
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lFLA
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FLA
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FLAvnanv
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me@me-EQ59:~/shell_demo$ sed -n '1s/fla/FLA/p' file1
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lFLA
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me@me-EQ59:~/shell_demo$ sed -n '1s/fla/FLA/g' file1
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me@me-EQ59:~/shell_demo$ sed -n '1s/fla/FLA/gp' file1
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lFLA
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me@me-EQ59:~/shell_demo$
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```
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- 替换 /user/local 为 lalala
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```
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me@me-EQ59:~/shell_demo$ cat file1
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lfla
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fla
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flavnanv
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rpprp
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/usr/local
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/user/local/bin
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dbdfblbjaljl;ka
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me@me-EQ59:~/shell_demo$ sed -n 's@/user/local@lalala@gp' file1
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lalala/bin
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me@me-EQ59:~/shell_demo$ sed -n 's#/user/local#lalala#gp' file1
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lalala/bin
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me@me-EQ59:~/shell_demo$
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```
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- 一到五行替换成#号
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```
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me@me-EQ59:~/shell_demo$ cat file1
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lfla
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fla
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flavnanv
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rpprp
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/usr/local
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/user/local/bin
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dbdfblbjaljl;ka
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me@me-EQ59:~/shell_demo$ sed -n '1,5s/^/#/gp' file1
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#lfla
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#fla
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#flavnanv
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#rpprp
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#/usr/local
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me@me-EQ59:~/shell_demo$
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```
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- 10.1.1.1 替换成 10.1.1.254
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```
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me@me-EQ59:~/shell_demo$ cat ip.txt
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10.1.1.1
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10.2.2.2
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me@me-EQ59:~/shell_demo$ sed -n 's/10.1.1.1/10.1.1.254/gp' ip.txt
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10.1.1.254
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me@me-EQ59:~/shell_demo$ sed -n 's/\(10.1.1.\)1/\1254/gp' ip.txt
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10.1.1.254 # 小括号括起来，保留为第一个正则表达式，后续使用 \1 来使用刚才保存的值
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me@me-EQ59:~/shell_demo$ sed -n 's#\(10.1.1.\)1#\1254#gp' ip.txt
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10.1.1.254
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me@me-EQ59:~/shell_demo$
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```
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- sed 结合正则
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