［1］在匹配內容的后面追加
??? 比如，想在文件中匹配 123（所有的三位數字） 的后面追加.html
??? sed -n "s/[0-9]\{3\}/&\.html/p" *.log
［2］多次重復匹配
??? 重復n次以上
??? sed -n "s/[0-9]\{3\}/&\.html/p" *.log
［3］替換內容中使用當前查找到的內容
??? sed "s/password:/&mypassword/g" database.yml
??? 例如：
??? 替換前的內容

development:
? adapter: mysql
? encoding: utf8
? database: blog_development
? pool: 5
? username: root
? password:
? host: localhost


test:
? adapter: mysql
? encoding: utf8
? database: blog_test
? pool: 5
? username: root
? password:
? host: localhost

production:
? adapter: mysql
? encoding: utf8
? database: blog_production
? pool: 5
? username: root
? password:
? host: localhost

替換后的內容
development:
? adapter: mysql
? encoding: utf8
? database: blog_development
? pool: 5
? username: root
? password:mypassword
? host: localhost


test:
? adapter: mysql
? encoding: utf8
? database: blog_test
? pool: 5
? username: root
? password:mypassword
? host: localhost

production:
? adapter: mysql
? encoding: utf8
? database: blog_production
? pool: 5
? username: root
? password:mypassword
? host: localhost








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