need help on linux problem please

6. [10 points) Given some text, use sort to rearrange the text so that the lines are sorted numerically, from largest to smallest, using positions 2-6 (starting from the beginning of the line). The columns are NOT delimited by anything. I mean by that, positions on a line of the file where the character at the left margin is column 1, the next character (without any space) is column 2 and so on. This is not the same as having columns separated by spaces, tabs, commas, etc. Read carefully Note that if you are sorting numerically, any line whose key does NOT contain an initial number is printed before all the lines that do have a numeric key. Those non- matching lines are printed in an arbitrary order, but it will probably be as they are encountered. In the normal numeric sort (no fields, no largest to smallest) matching lines are printed in numeric order with either the -n or -g switches. That means given 090 24sldkj that 090 would be printed AFTER 24sldkj. This means that the entire number is considered and leading O's are ignored