逍遥梦，梦逍遥

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http://opendream.blogbus.com/logs/37231779.html

Sort:

     #man sort

             ........

            -n, --numeric-sort
                    compare according to string numerical value

             -k, --key=POS1[,POS2]
                     start a key at POS1, end it at POS2 (origin 1)

            -t, --field-separator=SEP
                      use SEP instead of non-blank to blank transition

            -r, --reverse
                      reverse the result of comparisons

           ........
   Example:

     #cat  test.txt

        pengyao:3:good

        test:6:greate

        Peng.Yao:10:test

   1.以":"为分隔符排序

      #sort -t ":" test.txt

  2.对数字进行排序

     #sort -t ":" -k 2 -n test.txt

  3.对数字以大到小(逆向)进行排序

     #sort -t ":" -k 2 -n -r test.txt