Sorter

This program can sort a file (any regular file, say like an address list) of up to 8000 entries on up to 9 keys at once (with different priorities for each sort!). Sorts can be made alphabetically or numerically in increasing or decreasing order, and duplicate entries can be eliminated during the sort process. Each entry may consist of any number of lines of up to 250 characters length each, and the lines don't need to be of the same length. The sort is based on data in the first line only, and the data must be in the same columns for each entry.