sed practice

Review
extension

1. print line to line content http://ask.apelearn.com/question/559
   # sed -n '/特定字符/,/特定字符/'p test.txt
2. sed convert case http://ask.apelearn.com/question/7758
   1. In sed, use \u for uppercase and \l for lowercase
   2. Capitalize the first lowercase letter of each word:
      # sed 's/\b[a-z]/\u&/g' filename
   3. Convert all lowercase to uppercase:
      # sed 's/[a-z]/\u&/g' filename
   4. Uppercase to lowercase:
      # sed 's/[A-Z]/\l&/g' filename
3. sed adds a number at the end of a line http://ask.apelearn.com/question/288
   # sed 's/(^指定字符.*)/\1 数字/' test.txt
# sed 's/(^指定字符.*)/& 数字/' test.txt
# sed '/^指定字符/s/$/ 数字/' test.txt
4. Delete a line to the last line http://ask.apelearn.com/question/213

   # sed '/指定字符/{p;:a;N;$!ba;d}' test.txt  
   定义一个标签a，匹配c，然后N把下一行加到模式空间里，匹配最后一行时，才退出标签循环，然后命令d，把这个模式空间里的内容全部清除。  
   
   if 匹配"c"  
   :a
   追加下一行  
   if 不匹配"$"  
   goto a  
   最后退出循环，d命令删除。
   

   Delete the matching line and the next line of the matching line
   sed -i '/sample/{N;d}' filename
   //sample is the matching character, N here is the next line, d is the delete
5. Print 1 to 100 lines containing a string http://ask.apelearn.com/question/1048
   # sed -n '1,100{/sample/p}' 1.txt